Wednesday
May 22, 2013

# Homework Help: Math: Statistics

Statistics
A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterer's food. If sample proportion, P^, is the sample ...
Friday, March 22, 2013 at 3:59pm

statistics
A countrywide estate agency specializes in selling commercial ventures. Their records show that the mean selling time is less than 90 days. Because of recent economic conditions, they believe that the mean selling time is now greater than 90 days. A countrywide survey of 100 ...
Friday, March 22, 2013 at 7:59am

statistics
the average proportion of red candies in a pakage is 20% and an 8 oz package contains about 250 candies.What is the probability that a randomly selected 8 oz bag contains less than 45 red candies?
Friday, March 22, 2013 at 12:50am

statistics
The standard score for hours spent online at home for minnesotan was 3.00 approximately how many hours do minnsotan adults spend online at home? Show your work and round all cuclulation to the tenth
Thursday, March 21, 2013 at 8:21pm

statistics
Your program has an RDT&E-funded project scheduled to start in July 2005 which is expected to take 12 months to complete. The project is expected to cost a total of \$12 million (then-year dollars), with cost expected to be incurred at a rate of \$1 million per month. The ...
Thursday, March 21, 2013 at 1:59pm

life oriatation
3 environmental health hazard that cause ill health,crises or disaster within south africa and globally including evidence,graphs,statistics,pictures
Thursday, March 21, 2013 at 11:56am

statistics
the weights of shells follow a normal distribution. a random sample of 12 hybrid shells a a mean weight of 1.7 pounds with standard deviation 0.24 pounds. Find a 95 % confidence interval level for the mean weight if the fall catch is within 0.1 pounds of the sample estimate
Thursday, March 21, 2013 at 12:47am

Statistics
A random sample of 60 riders waited in line a mean time of 42 minutes with standard deviation 12 minutes. Find a 90% confidence interval for the populationmean waiting time in line
Thursday, March 21, 2013 at 12:45am

statistics
Scores on a visual perception test are normally distributed with a mean of 2020 and a standard deviation of 250. a)If one subject is randomly selected and tested, find the probability of a score greater than 1800 b)if 50 subjects are randomly selected and tested fid the ...
Thursday, March 21, 2013 at 12:44am

Statistics
Scores on a visual perception test are normally distributed with a mean of 2020 and a standard deviation of 250. a)If one subject is randomly selected and tested, find the probability of a score greater than 1800 b)if 50 subjects are randomly selected and tested fid the ...
Thursday, March 21, 2013 at 12:39am

statistics
The frequency of color blindness in the Caucasian American male population is about 8%. If a random sample of 125 individuals is chosen from this population, what is the probability that 5-10 individuals in the sample are color blind?
Thursday, March 21, 2013 at 12:16am

Statistics 250
What is the probability of randomly selecting a z-score less than z = –0.80 from a normal distribution. a)-0.2119 b)0.7881 c)0.2119 d)-0.7881
Wednesday, March 20, 2013 at 8:33pm

psychology statistics for behavioral sciences
A multiple-choice test has 48 questions, each with four response choices. If a student is simply guessing at the answers, a. What is the probability of guessing correctly for any question? b. On average, how many questions would a student get correct for the entire test? c. ...
Wednesday, March 20, 2013 at 7:01pm

statistics
The program plans to acquire a total of 600 end items costing \$570 million over a five-year period. The first production contract is to be awarded in FY04. The number of items to be procured (not delivered) each year and their estimated cost (in then-year dollars) is shown ...
Wednesday, March 20, 2013 at 12:02pm

statistics
Jim Tree sells trees. The mean length of the trees purchased was 68 inches with a standard deviation of 10 inches. Jim wants to know what percent of his sales were more than 84 inches tall. He can use the standard normal distribution to help him. He asks, "what is the ...
Wednesday, March 20, 2013 at 10:57am

Statistics
What is the 75th percentile of the adhesion distribution? A locomotive's 'adhesion' is the locomotive's pulling force as a multiple of its weight. A diesel locomotive model has adhesion which varies in actual use according to a Normal distribution with a mean ....
Tuesday, March 19, 2013 at 10:58pm

statistics
A service station has a pump that distributes diesel fuel to automobiles. The station owner estimates that only about 3.2 cars use the diesel pump every 2 hours. Assume the arrivals of diesel pump users are Poisson distributed. a. What is the probability that three cars will ...
Tuesday, March 19, 2013 at 10:37pm

Statistics
4. The data below are from an independent-measures experiment comparing three different treatment conditions. Treat. 1 Treat 2 Treat 3 0 1 4 0 4 3 G=24 0 1 6 2 1 3 Ó X² = 92 T=2 T=6 T=16 SS=3 SS=9 SS=6 Use an analysis of variance with á of .05 to determine ...
Tuesday, March 19, 2013 at 9:34pm

statistics
assume that the volume of drink is normally distributed, with a mean of 2.0 liters and a standard deviation of 0.05 liter. Using the random sample of 45 bottles. The probability is 99% that the sample mean will contain at least how much soft drink?
Tuesday, March 19, 2013 at 6:14pm

Statistics
The weight of adult green sea urchins are normally distributed with a mean 52g and standard deviation 17.2g? A. Find the percentage of adult green sea urchins with weighs between 50g and 60g My answer/work: normalcdf (50, 60, 52, 17.2) = .225, 23% B. Obtain the percentage of ...
Tuesday, March 19, 2013 at 6:09pm

Statistics
How high must a student score to place in the top 10% of all students taking the SAT? Scores on the SAT verbal test in recent years follow approximately the Normal with mean 504 and standard deviation 111. This is what I did. 1-.10=.9 Then I entered the data in my calculator ...
Tuesday, March 19, 2013 at 6:01pm

Statistics
Find the value of Z = 0.15?
Tuesday, March 19, 2013 at 5:59pm

Statistics
A market research company employs a large number of typists to enter data into a computer database. The time taken for new typists to learn the computer system is known to have a Normal distribution with a mean of 2.167 hours and a standard deviation 20 minutes. A candidate is...
Tuesday, March 19, 2013 at 5:58pm

Statistics
What is the 75th percentile of the adhesion distribution? A locomotive's 'adhesion' is the locomotive's pulling force as a multiple of its weight. A diesel locomotive model has adhesion which varies in actual use according to a Normal distribution with a mean ....
Tuesday, March 19, 2013 at 5:58pm

Statistics
The controller for a garage door opener has nine binary switches that can be set to either on or off. How many different total settings can be set on this controller?
Tuesday, March 19, 2013 at 3:41pm

Statistics and Probability
Why is a normal distribution called "normal"?
Tuesday, March 19, 2013 at 3:38pm

Statistics and Probability
Why is a normal distribution called "normal"?
Tuesday, March 19, 2013 at 3:20pm

math(statistics)
suppose a random variable X can equal to 1,2,3,4,or 5. if P(x<3)=.4 and p(x>3)=.5 (a)p(x=3) and b P(x<4)
Tuesday, March 19, 2013 at 3:03pm

math(statistics)
1. Assume that x is a binomial variable with an expected value of 3 and variance of 2.4 .find (a) P(x=0) (b) P(x=12) THnxs
Tuesday, March 19, 2013 at 3:00pm

Statistics PLZ HELP Urgent!!!!
PLZ Help me with the following questions! very urgent! The marketing department of a company would like to introduce 12 monthly special products in the coming 12 months. If these monthly special products are selected randomly from 24 products, find the probability that two ...
Tuesday, March 19, 2013 at 11:56am

statistics
The marketing department of a company would like to introduce 12 monthly special products in the coming 12 months. If these monthly special products are selected randomly from 24 products, find the probability that two specific products are the monthly special products in two ...
Tuesday, March 19, 2013 at 11:30am

Math-statistics
During the 2000 season, the home team won 138 of the 240 regular season National Football League games. Is this strong evidence of a home field advantage in professional football? Test an appropriate hypothesis and state your conclusion. Be sure the appropriate assumptions and...
Tuesday, March 19, 2013 at 10:33am

statistics
The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the standard deviation?
Monday, March 18, 2013 at 11:30pm

statistics
If you estimate a model y=a + b * x, where the dependent variable Y is measured in billions of dollars and your predictor variable X is measured in percent then "A" represents what?
Monday, March 18, 2013 at 9:32pm

statistics
a. A single student (n=1) b. For a mean of 50 student (n=50) c. For a mean of 500 students (n=500)
Monday, March 18, 2013 at 8:23pm

statistics
Suppose we take a random sample of size n from a normal population with variance, σ2 . It can be shown that (n−1)s2/σ2 has a chi-square distribution with n−1 degrees of freedom, where s is the sample variance. Below is a random sample of size 8 drawn from...
Monday, March 18, 2013 at 12:32am

statistics
a pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. how large should the sample be if she wishes to be accurate to within \$0.15? a previous study showed that the standard deviation of the price was \$0.26
Sunday, March 17, 2013 at 10:29pm

Statistics
32% of adult internet users have purchased products or services online. For a random sampling of 200 adult users, find the mean, variance and standard deviation for the number who have purchased goods or services online?
Sunday, March 17, 2013 at 10:22pm

stats.
Based on data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant US woman ( Chance, Spring 2001). Gestation length has mean of 280 days with a standard deviation of 20 days. a. Find the ...
Sunday, March 17, 2013 at 9:56pm

statistics
Based on data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant US woman ( Chance, Spring 2001). Gestation length has mean of 280 days with a standard deviation of 20 days. a. Find the ...
Sunday, March 17, 2013 at 9:13pm

statistics
The mean of nonresidential buildings is 30 years and the standard deviation of the ages of the buildings is 5 years. Determine the probability that a random sample of a group of 50 nonresidential buildings will have a mean age of less than 27.5 years.
Sunday, March 17, 2013 at 9:12pm

statistics
The average age of a vehicle registered in the United States is 8 years, or 96 months. Assume the standard deviation is 16 months. If a random sample of a group of 48 vehicles is selected find the probability that the mean of the group’s age is between 90 and 100 months.
Sunday, March 17, 2013 at 9:12pm

statistics
The amount that airlines speed on food per passenger is normally distributed with means \$8.00 and standard deviation \$2.00. What is the probability that a randomly selected airline spends more than \$12.50?
Sunday, March 17, 2013 at 9:11pm

Statistics
Suppose a basketball player is an excellent free throw shooter and makes 90% of his free throws (i.e., he has a 90% chance of making a single free throw). Assume that free throw shots are independent of one another. Suppose this player gets to shoot three free throws. Find the...
Sunday, March 17, 2013 at 12:50pm

Statistics
Problem During the dinner hour, the distribution of the inter-arrival time of customers at a restaurant is estimated to be as shown below. The mode of payment and the service times of the cash and credit card customers are shown in the following tables. Complete the tables and...
Sunday, March 17, 2013 at 1:15am

statistics
The highest point in the scatter is the point for Illinois, at 1807. The two just below it, at 1778 and 1777, are for Minnesota and Iowa. The lowest points are at 1391 and 1385, for Maine and D.C. respectively. Pick all the options that are correct. The scatter diagram shows ...
Saturday, March 16, 2013 at 4:04pm

statistics
Compare the standard deviation for the heights of females 2.533 and males 4.21
Saturday, March 16, 2013 at 3:07pm

Statistics
During September, the average temperature of Laurel Lake is 64.2º and the standard deviation is 3.2º. Assume the variable is normally distributed. For a randomly selected day, find the probability that the temperature will be a. Above 62º b. Below 67º c. ...
Saturday, March 16, 2013 at 1:57pm

statistics
The starting salaries of a random sample of three students who graduated from North Carolina State University last year with majors in the mathematical sciences are \$45,000, \$50,000, and \$40,000. Find a point estimate of the population mean of the starting salaries of all math...
Saturday, March 16, 2013 at 10:46am

statistics
Suppose that the heights of female adults in the US are normally distributed with a mean (µ) of 65.4 inches and a standard deviation (σ) of 2.8 inches. Let X denote the height of a randomly chosen adult female. Find the probability that X is between 66 and 70 inches:
Friday, March 15, 2013 at 4:47pm

Statistics
The eggs of a species of bird have an average diameter of 23 mm and an SD of 0.45 mm. The weights of the chicks that hatch from these eggs have an average of 6 grams and an SD of 0.5 grams. The correlation between the two variables is 0.75 and the scatter diagram is roughly ...
Friday, March 15, 2013 at 4:07pm

Statistics
The eggs of a species of bird have an average diameter of 23 mm and an SD of 0.45 mm. The weights of the chicks that hatch from these eggs have an average of 6 grams and an SD of 0.5 grams. The correlation between the two variables is 0.75 and the scatter diagram is roughly ...
Friday, March 15, 2013 at 4:00pm

Statistics
A quiz consists of 10 multiple choice questions. Each question is marked either “right” or “wrong.” Each right answer gets 5 points, and 1 point is taken off for each wrong answer. The correlation between the number of right answers and the number of wrong ...
Friday, March 15, 2013 at 12:46pm

Statistics
A large number of children were surveyed. The table below shows the distribution of the time they spent watching TV in the week before the survey. Intervals include the left endpoint but not the right. You can assume that the times are uniformly distributed within each ...
Friday, March 15, 2013 at 11:02am

Statistics
A class has 3 sections. Here is a summary of the scores on the final exam. Average SD Number of Students Section 1 68 9 20 Section 2 75 9 25 Section 3 60 9 32 Find the average score of all the students in the class.
Friday, March 15, 2013 at 10:59am

Statistics
A large number of children were surveyed. The table below shows the distribution of the time they spent watching TV in the week before the survey. Intervals include the left endpoint but not the right. You can assume that the times are uniformly distributed within each ...
Friday, March 15, 2013 at 10:36am

Statistics
A coin is tossed 10 times. What is the probability that the third head will apear on the tenth toss?
Thursday, March 14, 2013 at 10:35pm

statistics
A diabetes nurse educator believes that her patients have particularly bad control of their blood sugar. To test this she selected the fasting blood sugar values for 15 of the patients she saw this week. The national mean for patients with this level of severity of diabetes is...
Thursday, March 14, 2013 at 8:09pm

AP Statistics
Consider the following data collected in two recent surveys of whether voters in cities A and B favor a ballot proposition in the next election. City Sample Size In Favor A 615 463 B 585 403 Suppose you're going to conduct a significance test to see if there's a ...
Thursday, March 14, 2013 at 5:07pm

AP Statistics
12) Which of the following statements is true? a) The sampling distribution of the difference between two proportions will always be normal. b) When comparing two population proportions, either sample proportion can be used as the unbiased estimate of the true population ...
Thursday, March 14, 2013 at 4:53pm

Statistics
As reported in Runner's World magazine, the times of the finishers in the new york 10 km run are normally distrubted with a mean of 1.02 hours and a standard deviation of 9 minutes. Let X denote finishing time for the finishers. Then, A. Find the percentage of finishers ...
Thursday, March 14, 2013 at 10:06am

In a recent survey in a Statistics class, it was determined that only 60% of the students attend class on Fridays. From past data it was noted that 98% of those who went to class on Fridays pass the course, while only 20% of those who did not go to class on Fridays passed the ...
Wednesday, March 13, 2013 at 11:54pm

statistics
The Engineering Department Claims the Average Battery Lifetime is 500 Minutes. You wish to check whether the lifetime is different from 500 Minutes. What type of hypothesis test is it going to be?
Wednesday, March 13, 2013 at 6:35pm

maths (statistics)
A coin is constructd such dt tail cn appear 4 time as likely as d head appear. Dis coin is tossd wit a fair die. Define X= no of head on coin + no of head on die. 1. Wryt out d sample space 2. Whts d prob. Of X is 14. 3. Pr(X<=10) 4. Pr(X>=14)
Wednesday, March 13, 2013 at 5:10pm

Statistics
Direct mail advertisers send solicitations (a.k.a. "junk mail") to thousands of potential customers in the hope that some will buy the company's product. The response rate is usually quite low. Suppose a company wants to test the response to a new flyer, and ...
Wednesday, March 13, 2013 at 4:42pm

Describe a business situation, other than what has already been selected by fellow students or selected from the team assignment, where mean and standard deviation can be used in decision making. Describe how calculation of mean and standard deviation can help in making a ...
Wednesday, March 13, 2013 at 10:24am

Statistics
*Give all probabilities to two decimal places. Three daily newspapers are published in a large city. Suppose we have the following facts about the people in the city: 60% read Newspaper A. 34% read Newspaper C. 72% read Newspaper A or Newspaper B. 18% read Newspaper A and B. ...
Tuesday, March 12, 2013 at 1:09pm

Statistics
A box contains five numbered balls (1,2,2,3 and 4). We will randomly select two balls from the box (without replacement). (a) The outcome of interest is the number on each of the two balls we select. List the complete sample space of outcomes. (b) What is the probability of ...
Tuesday, March 12, 2013 at 1:06pm

Statistics
what is the probability that your second card is heart in general regardless of the card you drew first?
Monday, March 11, 2013 at 12:19pm

Statistics
I am struggling with how to answer this. It seems not enough information is given so it is really hard to agree or to disagree. (this is uni statistics) Assume you are the Store Manager for Coles in Wagga at the beginning of December 2012. An accountant in head offce has ...
Monday, March 11, 2013 at 3:26am

Statistics
We are given this table which is Benford law for these questions they are used for filling your taxes: k= p(X=k) 1 0.301 2 0.176 3 0.125 4 0.097 5 0.079 6 0.067 7 0.058 8 0.051 9 0.046 1.) If you select two numbers randomly from any where on your taxes what is the probability ...
Sunday, March 10, 2013 at 11:54pm

statistics
Last semester, a certain professor gave 23 As out of 279 grades. If one of the professor's students from last semester were selected randomly, what is the probability that student received an A? (Assume that each student receives one grade.)
Sunday, March 10, 2013 at 11:13pm

Statistics
A company that manufactures exercise machines wanted to know the percentage of large companies that provides on-site health club facilities. A sample of 240 such companies showed that 96 of them provide such facilities on site. a. What is the point estimate of the percentage ...
Sunday, March 10, 2013 at 5:12pm

statistics
If the average number of textbooks is 16, the standard deviation is 5, and the average age of a professors is 43, with a standard deviation of 8, which data set is more variable?
Sunday, March 10, 2013 at 3:50pm

Statistics
Suppose. Population of test-scores is normally distributed with mean 65 and standard deviation 13 x~n (65,13) if you select a test at randome what is the probability that the score is below 60 or that it is between 65 and 70 please show work!
Sunday, March 10, 2013 at 3:38pm

Statistics
"Working Mom’s Journal" reported that the mean time a mother, with her small children, spends in at the convenience store is 7.3 minutes. A sample of 20 moms is chosen from your neighborhood, and it is found that the mean time they spend in a convenience store ...
Sunday, March 10, 2013 at 1:30pm

Statistics
A private opinion poll is conducted for a politician favors decriminalizing marijuana possession. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 2%.
Sunday, March 10, 2013 at 3:38am

statistics
a towns average snowfall is 33 inches per year with a standard deviation of 11 inches. how many standard deviations from the mean is a snowfall of 66 inches
Saturday, March 9, 2013 at 10:16pm

statistics(HELP)ASAP
an art school knows that in general they go through 38 colored pencils per week. they have asked their students to hold their pencils differently over the past 10 weeks and wonder whether this has made a significant difference in the number of penccils they go through. dat aon...
Friday, March 8, 2013 at 11:34pm

Statistics
Consider the hypothesis test given by Ho:u=530, H1:u does not equal 530. In a random sample of 85 subjects, the sample mean is found to be 522.3. Also, the population standard deviation is 29. Determine the P-value for this test. Is there sufficient evidence to justify the ...
Friday, March 8, 2013 at 9:35pm

statistics(HELP)ASAP
an art school knows that in general they go through 38 colored pencils per week. they have asked their students to hold their pencils differently over the past 10 weeks and wonder whether this has made a significant difference in the number of penccils they go through. dat aon...
Friday, March 8, 2013 at 9:33pm

Statistics
A nurse at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 99% confident that the true mean is within 2 ounces of the sample mean? The standard deviation of the birth weights is known to be 7 ...
Friday, March 8, 2013 at 5:09pm

statistics
s = sqrt { [ 9 + 1 + 1 + 9 ] / 3 } = sqrt (20 / 3) = sqrt ( 6.67 ) = 2.58 how they get the 2.58
Friday, March 8, 2013 at 3:54am

Statistics
The 60th percentile of a normal distribution is 110. The 70th percentile is 120. Find the 90th percentile.
Thursday, March 7, 2013 at 10:23am

Statistics
Find the 35th percentile of the normal distribution with mean 270 and SD 25.
Thursday, March 7, 2013 at 10:23am

Statistics
Fill in the blank: 50% of the area under the standard normal curve is between -0.5 and _____________.
Thursday, March 7, 2013 at 10:22am

Statistics
The average weight of a group of people is 156 pounds and the SD is 25 pounds. A statistician wants to transform the weights so that the transformed weights have an average of 100 pounds and an SD of 10 pounds. Fill in the blanks; both blanks must be filled in correctly for ...
Thursday, March 7, 2013 at 10:21am

Statistics
In the quiz in Exercises 1 and 2, the grading scheme is as follows: each right answer is awarded 5 points, and 1 point is taken off for each wrong answer. Recall that the quiz consists of 10 questions, and that in the class, the average number of right answers is 6.2 and the ...
Thursday, March 7, 2013 at 10:20am

Statistics
A quiz consists of 10 questions. Each question is marked either “right” or “wrong.” For each student in the class, the instructor keeps a record of the number of right answers the student got. In the class, the average number of right answers is 6.2 and the...
Thursday, March 7, 2013 at 10:10am

Statistics
A list of numbers has an average of 48 and an SD of 12. The list is transformed by subtracting 3 from each entry and then dividing the result by 5. (1) Find the average of the transformed list. (2) Find the SD of the transformed list.
Thursday, March 7, 2013 at 10:09am

Statistics
Using the following Minitab output write the straight line (least squares) equation and the correlation coefficient. The regression equation is Sales = 27.2 + 0.252 Exp Predictor Coef SE Coef T P Constant 27.195 5.781 4.70 0.005 Exp 0.2517 0.4201 0.60 0.575 S = 8.97833 R-Sq = ...
Wednesday, March 6, 2013 at 7:06pm

statistics
In a survey randomly selected subjects, the mean age of the 36 respondents is 40.0 years and the standard deviation of the ages is 10.0 years. Use these sample results to construct a 95% confidence interval estimate of the mean age of the population from which the sample was ...
Wednesday, March 6, 2013 at 1:21pm

statistics
Assume that we collect a large (n>30) simple random sample of annual incomes of adults in the United States. Because the sample is large, can we approximate the distribution of those incomes with a normal distribution ? Why or why not?
Wednesday, March 6, 2013 at 1:10pm

Statistics
The rate of chlamydia infection was reported as 2.78% in a recent year. Under certain conditions, a preliminary screening test for the chlamydia bacterium is correct 96% of the time. One person is randomly selected from the population. find the true positive. Can someone ...
Wednesday, March 6, 2013 at 9:56am

1.  Suppose that the mean of the annual return for common stocks from 1950 to 2012 was 9.4%, and the standard deviation of the annual return was 17.5%.  Suppose also that during the same 62-year time span, the mean of the annual return for long-term government bonds ...
Wednesday, March 6, 2013 at 9:34am

statistics
A balloon mannufacturer kows that historically her company has produced 614 balloons per day (standard deviation =36) she has changed the process and wants to know wheathert he new process is increased the number of ballons made. the sample mean is 620. 0.5, n=16
Tuesday, March 5, 2013 at 9:47pm

statistics
The average admission charge for a movie is \$6. if the distribution of movie admission charges is approximately normal with a standard deviation of \$1, what is the probability that a randomly selected admission charge is less than \$3.5?
Tuesday, March 5, 2013 at 7:14pm

Math Statistics
The hieght of women are approximately normally distributed with a mean of 65.4 inches and a standard deviation of 2.5 inches. What percent of these women would be over 70 inches or more? 70-64.5/2.5 = 2.2 Is this correct? How would I determine the hieghts of the shortest 8% of...
Tuesday, March 5, 2013 at 7:07pm

Statistics
An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.5 years of age. If the standard deviation is assumed to be 4.1 years, find the probability that a random sample of 32 U.S. women would show a mean age at ...
Tuesday, March 5, 2013 at 1:52pm

stats
Which test do you use to solve this problem One-sample or independent samples t-test? Over the summer I asked my statistics students to report their gender and their level of statistics anxiety. Using a one-tailed test, determine whether females have more statistics anxiety ...
Tuesday, March 5, 2013 at 12:11pm

stats
Which test do you use to solve this problem One-sample or independent samples t-test? Over the summer I asked my statistics students to report their gender and their level of statistics anxiety. Using a one-tailed test, determine whether females have more statistics anxiety ...
Tuesday, March 5, 2013 at 12:11pm

statistics
An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 25.1 years of age. If the standard deviation is assumed to be 4.6 years, find the probability that a random sample of 34 U.S. women would show a mean age at ...
Tuesday, March 5, 2013 at 9:32am

statistics
*Give all probabilities to four decimal places. Bowl #1 contains 4 grape candies, 5 lemon candies, 6 cherry candies and 5 raspberry candies. Bowl #2 contains 8 grape candies, 5 lemon candies, 4 cherry candies and 3 raspberry candies. (c) What is the probability that the two ...
Monday, March 4, 2013 at 8:34pm

statistics
Bowl #1 contains 4 grape candies, 5 lemon candies, 6 cherry candies and 5 raspberry candies. Bowl #2 contains 8 grape candies, 5 lemon candies, 4 cherry candies and 3 raspberry candies. (c) What is the probability that the two selected candies are the same flavour? (d) What ...
Monday, March 4, 2013 at 8:08pm

Statistics
A company that manufactures exercise machines wanted to know the percentage of large companies that provides on-site health club facilities. A sample of 240 such companies showed that 96 of them provide such facilities on site. a. What is the point estimate of the percentage ...
Monday, March 4, 2013 at 4:04pm

statistics
Percentage grades in a large physics class follow a normal distribution with mean 58. It is known that 3% of students receive grades less than 39.2. What is the standard deviation of grades in the class?
Monday, March 4, 2013 at 1:39pm

statistics
Is "42% of the people in New York City have 0+ blood" desriptive or inferential?
Monday, March 4, 2013 at 10:34am

statistics
8) Why did you choose this figure as the warranty? What percentage of bulbs would need to be replaced if you chose a warranty of 7000 or 7500? Justify your answer statistically. How do you explain this to the board of directors, marketing people and financial people?
Sunday, March 3, 2013 at 9:50pm

statistics
7) Your employer, Woodbridge Electric Inc., wants to offer a warranty on the new compact fluorescent light bulb that they have produced and tested. You are called into a meeting and operational experts provide the following data: mean bulb life = 8000 hours, standard deviation...
Sunday, March 3, 2013 at 9:49pm

math
As South Campus, the student-faculty ration is about 16 to 1. If the 128 students enroll in Statistics 101, how many sections should be offered?
Sunday, March 3, 2013 at 9:45pm

Statistics
A multiple choice test has five choices. Therefore the probability of getting the correct answer by guessing is 0.2. The test has six questions. Use the binomial formula with n = 6 and p = 0.2 to (a) Determine probability of getting two questions correct. (b)Determine ...
Sunday, March 3, 2013 at 7:22pm

Statistics
The heights of young women are approximately normally distributed with a mean of 64.5 inches and a standard deviation of 2.5 inches. Determine the following: what percent of young women would be acceptable as members if being a member required a height of 70 inches or more? ...
Sunday, March 3, 2013 at 7:20pm

statistics
In order to plan for parking and transportation needs at a college, administrators asked students how they got to school. Some came by bus, some came by car and the others used “personal “ transportation – bikes, skateboards, or walked. The following table ...
Sunday, March 3, 2013 at 7:18pm

statistics
about what percent of the bags of pet food weigh less than 49.8 lb?
Sunday, March 3, 2013 at 3:00pm

statistics
Given that the general population is normally distributed on a standard scale measuring math aptitude with Mean = 50 (s.d. = 10), approximately what percentage of the population has a math aptitude score between 40 and 60?
Sunday, March 3, 2013 at 1:16pm

Math Statistics
1. How many ways can you possibly have if you bet on a single number if there are 38 possible number of choices you have? 2. How many winning combinations can you have when you have 12 numbers to choose from out of 38?
Sunday, March 3, 2013 at 9:44am

Statistics
Suppose that 7.6% of all people are allergic to the H1N1 vaccine. A sample of 517 people are selected a. Calculate the probability that less than 8% of the sample will be allergic to vaccine.
Sunday, March 3, 2013 at 4:53am

statistics
The composition of the 108 congress was 51 republican 48 democrats and 1 independent.a committee on aid to higher education is to be form with 3 senators to be chosen random to head the committee. find the probability that the group of 3 consist of, all republicans , all ...
Saturday, March 2, 2013 at 5:53pm

statistics
The U.S. Census Bureau reported 77% of the U.S population had internet access in 2009. Choosing 3 random individuals find the probability that a. none of the 3 inidivuals has internet b. all of the individuals have internet access c. at least 1 of the 3 individuals has ...
Saturday, March 2, 2013 at 4:28pm

Statistics
DIAGRAMS MUST BE DRAWN Given the standard normal distribution, determine:Prob Z greater than 1.50 Prob Z between1.06 and 1.96 Given the standard normal distribution determine the Z values that contain 80% in the middle of the curve.
Saturday, March 2, 2013 at 2:51pm

Statistics
This is a standard deviation contest. You have a six sided die with the numbers 1 to 6 written on the faces. a)In order to have the smallest possible standard deviation what number(s) would have to show up if you rolled the die five times? b)In order to have the largest ...
Saturday, March 2, 2013 at 2:46pm

statistics
Boxes of bran flakes are known to be normally distributed with a mean weight of 475g and a standard deviation of 10g.Calculate the probability of a box having a weight exceeding 485 grams. Calculate the probability that the mean weight of sixteen boxes will exceed 480g.
Saturday, March 2, 2013 at 2:43pm

Statistics
Consider a basketball game where a player throws from the free throw line. Her success rate is 65%. If she throws 10 times in a game determine the following:The mean and standard deviation of this binomial distribution.
Saturday, March 2, 2013 at 2:39pm

Statistics
2. (TCO 5) A company produces electronic equipments claims that 98% of their products never need any kind of maintenance. We selected 10 of their products and we wanted to know the probability that 8 of them never need maintenance. Choose the best answer of the following: (...
Friday, March 1, 2013 at 9:57pm

math-statistics
Assume the body temperature of healthy adults are normally distributed with a mean of 98.20 degrees F (based on data from the Uniservity of Maryland researchers).a. If you have a body temperature of 99.oo degrees F, what is your percentile score? b. Convert 99.00 degrees F to ...
Friday, March 1, 2013 at 6:58pm

Math-statistics
Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantiles: a.percentage of scores less than 100 b. relative frequency of scores less than 120 c. percentage of scores less ...
Friday, March 1, 2013 at 6:31pm

statistics
I am seeing some inconsistencies with regards to finding the upper and lower quartiles when you you have an odd number in your data set. Which is correct, counting the median in both your upper and lower set, or ignoring it?
Friday, March 1, 2013 at 5:40pm

statistics
A residential treatment facility tests a new group therapy for patients with self destructive behaviors. To decrease scores of behaviors that has a mean in the overall population of 35 and a standard deviation of 4.7. The mean score for patients after new group therapy is 27. ...
Friday, March 1, 2013 at 3:37pm

statistics
#1: Total students 237, total males 41, need to estimate the proportion of students that are male using 90% confidece level. Also #2: estimate the proportion of students that commute less than 5 miles to work within 2% , what sample size would you need. Total students 237. ...
Friday, March 1, 2013 at 2:55pm

STATISTICS
I need help with 2 questions-TODAY-HELP 8. Assume that the MM207 Student Data Set is a random sample of all Kaplan students; estimate the proportion of all Kaplan students who are male using a 90% level of confidence. 9. Assume you want to estimate with the proportion of ...
Friday, March 1, 2013 at 10:59am

Criminology Statistics
A given distribution has a mean of 60. A score of 75 had a corresponding z of +2.00. The standard deviation is
Friday, March 1, 2013 at 10:44am

Statistics
Find the average of the distribution given below. Value Percent of entries -16 10 -3 25 5 45 8 20
Friday, March 1, 2013 at 8:08am

Statistics
A firm has 82 employees. The average commute distance (that is, the travel distance from home to work) of the employees is 6.2 miles. How many employees have a commute distance of less than 15.5 miles? Select all that are correct. more than 25 more than 35 more than 45
Friday, March 1, 2013 at 8:06am

Statistics
A real estate company is selling 32 houses. One of the houses costs \$834,000, but in order to attract more buyers, the price is dropped to \$819,000. By how much does this change the average price of the 32 houses?
Friday, March 1, 2013 at 7:24am

Statistics
As part of a fund raising campaign, the 12 members of the governing board of an organization pledge to raise \$100,000. In the first month of the campaign, the average amount raised by the 12 board members is \$5,200. How much more must they raise, on average, so that they can ...
Friday, March 1, 2013 at 7:23am

StatIstics
"Household size" is defined as the number of people living in a household. In a sample of 1200 households in California in 2010, the average household size was 2.9 people. Which of the following conclusions can be drawn from this information? Select all that are ...
Friday, March 1, 2013 at 7:21am

statistics
The SAT scores of a certain population of students are approximatley normally distributed with a mean and standard deviation of 1000 and 200 points, respectively. the probabilalty that a student selected at random from the population has an SAT score between 800 and 1200 is?
Thursday, February 28, 2013 at 1:49pm

statistics
Assume you want to estimate with the propoportion of student who commute less than 5 miles to work(20) with in 2%, what sample size would you need. Total in survey is 233
Thursday, February 28, 2013 at 12:38pm

statistics
Using the average and standard devation for length variable from problem 3,find the probability that the length of 35 movies is less than 120 minutes. Assume the distribution is normally distributed. interpret your result.
Wednesday, February 27, 2013 at 6:46pm

Statistics
What sample size is needed to find the percent of the customers at a store that are married, if 90% confidence is desired to be within a 5% margin of error?
Wednesday, February 27, 2013 at 12:05pm

statistics
A professional employee in a large corporation receives an average of = 45 e-mails per day. Most of these e-mails are from other employees in the company. Because of the large number of e-mails, employees find themselves distracted and are unable to concentrate when they ...
Wednesday, February 27, 2013 at 9:35am

statistics
Suppose a random sample of 80 measurements is selected from a population with a mean of 65 and a variance of 300. Select the pair that is the mean and standard error of x.
Tuesday, February 26, 2013 at 4:04pm

statistics
Suppose a random sample of 80 measurements is selected from a population with a mean of 65 and a variance of 300. Select the pair that is the mean and standard error of x.
Tuesday, February 26, 2013 at 4:03pm

Statistics
A simple random sample of 120 SAT scores ahs a mean of 1540. Assume that SAT scores have a population standard deviation of 333. a) Construct a 95% conf. interval estimate of the mean SAT score. b) Is a 99% conf. interval estimate of the mean SAT score wider than the 95% conf...
Tuesday, February 26, 2013 at 1:16pm

Statistics
Out of 4 architects, 6 engineers and 9n electricians, how many ways can a group of 6 people be formed to attend a forum if there are at least 3 electricians?
Monday, February 25, 2013 at 7:17pm

Statistics
Is it appropriate to call the numbered lock combination in our doors and drawers a "combination?" Explain.
Monday, February 25, 2013 at 7:16pm

statistics
The average height for Chinese women is 62.5 inches with a standard deviation of 4.6 inches. What is the probability that a randomly selected woman in the United States would be ≥69 inches tall?
Monday, February 25, 2013 at 6:14pm

statistics
In a certain region, the mean annual salary for plumbers is \$51,000. Let x be a random variable that represents a plumber's salary. Assume the standard deviation is \$1300. If a random sample of 100 plumbers is selected, what is the probability that the sample mean is ...
Monday, February 25, 2013 at 11:14am

statistics
the breaking distance of a Honda CRV can be approximated by a normal distribution, where the mean is 53 meters and the standard deviation is 3.8 meters. Let x be a random variable that represents a braking distance. Find the probability that a randomly selected braking ...
Monday, February 25, 2013 at 11:09am

Statistics
Problem 4 Refer to the box plots in Problem 3. : 4.0 points Compare experiments 4 and 5. When drawn on the same scale, the histogram for one of them has a noticeably higher peak the histogram for the other. From the box plots alone, can you tell which one has the higher peak? ...
Monday, February 25, 2013 at 3:31am

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