Homework Help: Math: Statistics

Recent Homework Questions About Statistics

statistics
If Q2 = D5 = Median Which means if the 2nd quartile equals to 5th decile and also the median.. then how do we find out the fourth decile? I mean is there a way to find it out through this? Then what is D4 going to be? I am talking about Deciles here..
Saturday, December 3, 2011 at 10:57pm

statistics
Q2 = D5 = Median Then what is D4 going to be? I am talking about Deciles here
Saturday, December 3, 2011 at 10:56pm

statistics
A company assembles drills using components from two sources. Acemart supplies 91% of the components and Begud supplies the rest. It is known that 6% of the components supplied by Acemart are faulty and 3% of those supplied by Begud are faulty. a) represent this info on a tree...
Saturday, December 3, 2011 at 8:29pm

statistics
For any married couple who are members of a squash club, the probability that the husband has a degree is 2/4 and the probability that the wife has a degree is 1/4. The probability that the husband has a degree given that his wife has a degree is 3/9. A married couple is ...
Saturday, December 3, 2011 at 8:23pm

statistics
A sixth form class consists of 6 girls and 9 boys. Three students from the class are chosen at random. The number of boys chosen is denoted by the random variable X. Show that a)P(X=0)=120/2730 b)P(X=2)=1296/2730
Saturday, December 3, 2011 at 8:17pm

statistics
Q2 = D5 = Median Then what is D4 going to be? I am talking about Deciles here..
Saturday, December 3, 2011 at 5:20pm

Statistics
Hi. I need to complete hypothesis tests and i am unsure if i used the correct tests for each of the following: 1. Do people actually prefer Pepsi or Coke in a taste test? 2. Can people correctly identify Pepsi versus Coke? 3. Are people consistent with their prior preference? ...
Saturday, December 3, 2011 at 3:27pm

statistics
if high count is greater thank 8, medium count greater than 4 less than or equal to 8, and low is less than or equal to 4 write an inequality to find the range at which the count is not medium
Saturday, December 3, 2011 at 2:18pm

statistics
1.a person selects a card from a deck .it is a red card ,he wns 1$.if it is black face card between or including 2 and 10,he wins $5.if it is black face card,he wins $10 and if it is black ace,he wins $100.find the expectation of the game is to be fair? 2.if 30% of all ...
Saturday, December 3, 2011 at 1:47pm

statistics
If a population has a standard deviation ó of 25 units, what is the standard error of the mean if samples of size 100 are selected?
Friday, December 2, 2011 at 5:52pm

statistics
2. Transform the following numeric data concerning client ages into categories of young (under 40), middle-aged (40 to 60), and older (over 60). Put your answers in the Category column of the table below: Client Age Category Lois 46 Gene 53 Evelyn 36 Albert 39 Bill 18 Karen 61
Friday, December 2, 2011 at 5:42pm

statistics
If a population has a standard deviation ó of 25 units, what is the standard error of the mean if samples of size 100 are selected?
Friday, December 2, 2011 at 4:37pm

statistics
Among the four northwestern states, Washington has 51% of the total population, Oregon has 30%, Idaho has 11%, and Montana has 8%. A market researcher selects a sample of 1000 subjects, with 450 in Washington, 340 in Oregon, 150 in Idaho, and 60 in Montana. At the 0.05 ...
Friday, December 2, 2011 at 3:18pm

statistics
A POLL OF 1300 RANDOMLY SELECTED STUDENTS IN GRADES 6 THROUGH-8 WAS CONDUCTED AND FOUND THAT 54% ENJOY PLAYING SPORTS. WOULD CONFIDENCE IN THE RESULTS INCREASE IF THE SAMPLE SIZE WERE 3000 INSTEAD OF 1300? WHY OR WHY NOT?
Friday, December 2, 2011 at 3:06pm

Statistics
What is the confidence interval for c= 0.95 x = 5.3, s = 0.5 , and n =53
Friday, December 2, 2011 at 2:51pm

statistics
Consider a sample mean (xbar) of 46 caluclated from a sample of size 35 drawn from a population of over 1000. Would it be appropriate to use the standard score table to look up the probability of a z score calculated on these data? Why or why not?
Friday, December 2, 2011 at 2:30am

statistics
A set of data is normally distributed with a mean of 98 and a standard deviation of 15. What is the probability that the value from the data is less than 88 ?
Thursday, December 1, 2011 at 9:40pm

STATISTICS QUESTION
if i have x^2 = 20.303 with 9 degrees of freedom and a significance level of .05 how do i figure out the P-value and by X^2 i mean chi square
Thursday, December 1, 2011 at 8:56pm

English
I have started on my initial draft and turning it into an essay. Like I said before it is about Banning cellphones while texting/driving and my main objective is that the device serves as a distraction leading to consequences.. We have to use research skills , comparison, ...
Thursday, December 1, 2011 at 8:46pm

statistics question
if i have x^2 = 15.505 and 9 degrees of freedom and a significance level of .10 how do i figure out the p value on my calculator?
Thursday, December 1, 2011 at 8:35pm

statistics
minnie went to union high school while mickey went to southern high school. both schools have equally challenging classes, class size, grading policies, etc. the one difference is in their year end tests. the union high test is out of 100 points, whereas the southern high test...
Thursday, December 1, 2011 at 8:06pm

statistics
A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. I need more than the answer. I'm looking for help on the steps to get to the answer, please. Thanks
Thursday, December 1, 2011 at 6:51pm

statistics
A statistician is testing the null hypothesis that exactly half of all engineers will still be in the profession 10 years after receiving their bachelor's. She took a random sample of 200 graduates from the class of 1979 and determined their occupations in 1989. She found ...
Thursday, December 1, 2011 at 6:18pm

statistics
Tax Preparers Inc. works 250 days per year. The company uses adding machine tape at a rate of eight rolls per day. Usage is believed to be normally distributed with a standard deviation of three rolls during lead time. The cost of ordering the tape is $10 and holding costs ...
Thursday, December 1, 2011 at 3:54pm

Statistics
True or False: If the value of the correlation, r, is zero then there is no association between the two quantative variables.
Thursday, December 1, 2011 at 2:48pm

Statistics
In the July issue of Archives of Neurology, researchers reported studying the smoking habits of 12000 people (3000 with Parkinson's disease and 9000 healthy people). They found that those who had smoked the most (the equivalent of a pack a day for 60 years) had the lowest ...
Thursday, December 1, 2011 at 2:47pm

Statistics
The weights of trout in a certain river follow a normal distribution with mean 3 pounds and standard deviation 0.8 pounds. What proportion of trout weigh between 3.2 pounds and 4.8 pounds? a.) .3891 b.) .9972 c.) .9452 d.) .5865
Thursday, December 1, 2011 at 2:47pm

statistics
130dan72 Ã§Ä±k
Thursday, December 1, 2011 at 12:07pm

statistics
A manager wishes to determine the relationship between the number of miles (in hundreds of miles) the manager's sales representatives travel per month and the amount of sales (in thousands of dollars) per month. Find the equation of the regression line for the given data. ...
Thursday, December 1, 2011 at 11:09am

statistics
How do we compute sample size fluctuations? Suppose we have a population of 16000 and a sample size of 30, and the number of samples 1000, what will be the impact on population mean and standard deviation when the population is normally distributed? When the population is ...
Thursday, December 1, 2011 at 8:19am

statistics
one out of three adults has worked in the restaurant industry at some point during his or her life. In an office of 84 workers, how many of these people would you expect to have worked in the restaurant industry at some point?
Thursday, December 1, 2011 at 6:42am

statistics
determine the probability that a sample of 49 boxes will have a mean weight below 365 grams. past records show that the population mean is 368 grams and the population standard deviation is 7. the probability will be between.
Wednesday, November 30, 2011 at 11:08pm

statistics
the mean of all possible means(when dealing with a sampling distribution) will be equal to the population mean.
Wednesday, November 30, 2011 at 11:05pm

statistics
Determine the probability that a sample of 49 boxes will have a mean weight below 365grams. past records show that the population mean is 368 grams and the population standard deviation is 7. the probability will be between
Wednesday, November 30, 2011 at 10:54pm

statistics
Find the area under the standard normal curve for the following: (A) P(z < -1.80) (B) P(-1.93 < z < 0) (C) P(-0.17 < z < 2.05)
Wednesday, November 30, 2011 at 7:41pm

statistics
Find the value of z such that approximately 20.88% of the distribution lies between it and the mean.
Wednesday, November 30, 2011 at 7:40pm

statistics
Measures of Central Tendency,variability, and postion 12th Grade math class. organize the data 78,67,95,85,84,86,82,75,85,94,91,57,78,77,88,90,91,86,84,82,75,58,73,75. Then do 4 columns of Grades,Deviations,Squares,and Z-Scores
Wednesday, November 30, 2011 at 12:21pm

statistics
What is the probability that a student in a college of 650 students in both a math major and a computer science major ( assuming these events are independent) If there are 72 math majors and 105 computer science majors?
Wednesday, November 30, 2011 at 12:09pm

STATISTICS HELP PLEASE
Gender Math M 690 M 550 F 800 F 610 M 540 F 660 M 700 M 560 F 560 M 390 F 530 M 560 F 590 F 520 M 740 F 560 M 620 M 700 M 620 F 500 M 760 F 710 M 590 M 670 M 670 a. Determine whether the sample provides statistical evidence that males have higher Math scores than females at ...
Wednesday, November 30, 2011 at 11:01am

statistics am i right so far
SO FAR I HAVE 9.63 FOR THE 1ST 2 COLUMNS AND 7.56 FOR LAST COLUMN FOR THE VARIANCES. I GOT Z= .0875 SEDIFF =1.2364 SEm=.6019 for 1st set of #s and SEm=1.08 for 2nd set of #s is that correct and now what? A total of 23 High School students were admitted to State University. Of ...
Wednesday, November 30, 2011 at 10:49am

statistics
Find a z value to the right of the mean so that 74.5% of the distribution lies to the left of it.
Tuesday, November 29, 2011 at 9:58pm

statistics
4. Assume you are just planning this survey and want to know how many individuals you have to randomly select to be part of the sample. Assume that the purpose of the study is to calculate a 95% confidence interval for proportion of the adult population who favor lowering the ...
Tuesday, November 29, 2011 at 2:56pm

statistics
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 80 people. (a) How many would you expect to be between 159 and 171 cm tall (b) How many would you expect to be taller than 160 cm
Tuesday, November 29, 2011 at 12:03pm

STATISTICS HELP PLEASE
A total of 23 High School students were admitted to State University. Of those students, 7 were offered athletic scholarships. The school’s guidance counselor looked at their composite ACT scores (given in the table below), wondering if State U might admit people with ...
Tuesday, November 29, 2011 at 10:52am

statistics
An engineering company believes it has developed a faster way to complete the assembly of an industrial machine. The present process takes an average of 6.5 hours to complete and the times it takes to complete the process are approximately normally distributed. If the mean ...
Tuesday, November 29, 2011 at 12:20am

statistics
5. The table below shows Psychology exam scores, Statistics Exam scores, and IQ scores for a random sample of students. What can you observe in the relationship between IQ and psychology, psychology and statistics, and IQ and statistics? Using a web-calculator, obtain the ...
Tuesday, November 29, 2011 at 12:12am

statistics
This table shows claims and their probablity for an insurance company. AMOUNT OF CLAIM PROBABILITY $0 0.65 $50,000 0.25 $100,000 0.06 $150,000 0.02 $200,000 0.01 $250,000 0.01 1. Calculate the expected value? 2. How much should the company charge as an average premium so that ...
Monday, November 28, 2011 at 9:39pm

statistics
Determine the sample size needed in order to be 95 percent confident the p, the sample proportion of HD television sets that last at least five years without a single repair, is within 0.03 of , the true proportion of sets that last at least five years without a single...
Monday, November 28, 2011 at 8:32pm

statistics
a test has a mean score 73 with standard deviation of 12.students with scores greater than 85 recieve an A. What is the percent of the students would we expect to get an A? assume the normal distribution
Monday, November 28, 2011 at 7:31pm

statistics
Suppose we have a set of blood pressures with a mean of 110 Systolic, and a sample standard deviation of 15 points. If we assume a normal distribution of Systolic blood pressures, then between what two values can we be assured 99.7% of all Systolic blood pressures will lie?
Monday, November 28, 2011 at 3:57pm

Statistics
I have the answer to this question,, but i'd like to know how to do it. I need help finding z. Any help would be great. Thanks. Children and McDonaldfs In a Sports Illustrated for Kids survey of 603 children, 43% preferred McDonaldfs for fast food. The next ...
Monday, November 28, 2011 at 2:46pm

Statistics
The average hourly wage of employees in a large nationwide industry is $12.96. Assume the variable is normally distributed, with a standard deviation of $4.46. In a randomly selected sample of 10,000 such employees, how many of them (correct to the nearest hundred) would you ...
Monday, November 28, 2011 at 2:36pm

statistics
If scores are normally distributed with a mean of 3.06 and a standard deviation of 0.84, what percent of the scores is: (a) greater than 3.9? (b) less than 2.22? (c) between 2.22 and 3.9?
Monday, November 28, 2011 at 2:35pm

statistics
Before 33 33 38 33 35 35 40 40 40 31 After 34 28 25 28 35 33 31 28 35 33 Ten different families are tested for the number of gallons of water per day they use before and after viewing a conservation video. Construct a 90% confidence interval for the mean of the differences.
Monday, November 28, 2011 at 1:31pm

statistics
Composite ACT Scores Non-Athletes Athletes 25 21 22 22 27 21 19 29 24 25 26 27 24 30 19 25 27 23 24 26 17 23 23 a. Test an appropriate hypothesis and state your conclusion. Use alpha = .05 for your test. Show the null and alternative hypothesis, the p-value, your conclusion to...
Monday, November 28, 2011 at 1:29pm

statistics
Suppose that weights of 5th grade elementary boys are normally distributed with mean µ =90 lbs and variance ó2 = 4 lbs. Find the weight that corresponds to Q3 and interpret this measure of position.
Monday, November 28, 2011 at 12:36pm

statistics
eight pairs of data yield the regression equation y^1=55.8+2.79x. What is the value of y for x=5.6?
Sunday, November 27, 2011 at 11:09pm

statistics
2. In a filing system containing a total of 15,200 records, 85 are identified as misfiles. What is the filing accuracy rate for this area? Round to the second decimal point and show your work
Sunday, November 27, 2011 at 10:36pm

statistics
You measure 34 turtles' weights, and find they have a mean weight of 66 ounces. Assume the population standard deviation is 9.3 ounces. Based on this, construct a 90% confidence interval for the true population mean turtle weight. Give your answers as decimals, to two places
Sunday, November 27, 2011 at 9:05pm

statistics
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be115 or more?
Sunday, November 27, 2011 at 8:53pm

statistics
A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 4% margin of error at a 99% confidence level, what size of sample is needed?
Sunday, November 27, 2011 at 8:36pm

statistics
If a student had 120 hours of TV and 100 hours of homework, what is their predicted reading score?
Sunday, November 27, 2011 at 5:38pm

statistics
Ann spends 2/7 of her pay on rent. What fraction of her pay is left?
Sunday, November 27, 2011 at 5:32pm

statistics
if a 2-tail p value is .56 and the alpha is .05 how do i interpret the results?
Sunday, November 27, 2011 at 2:40pm

Statistics
Refer to the baseball 2008 data, which report information on the 30 Major League Baseball teams for the 2008 season. Let the number of games won be the dependent variable and the following variable be independent variables: Team batting average, number of stolen bases, number ...
Sunday, November 27, 2011 at 12:22pm

statistics
If the random variable z is the standard normal score and a > 0, is it true that P(z > -a) = P(z < a)? Why or why not?
Saturday, November 26, 2011 at 9:19pm

statistics
Find the (two) z-scores that bound the middle 40% of the standard normal distribution. please show the work.
Saturday, November 26, 2011 at 9:18pm

statistics
Suppose that in the aerobic exercise group we also measured the number of hours of aerobic exercise per week and the mean is 5.2 hours with a standard deviation of 2.1 hours. The sample correlation is -0.42. a)Is there evidence of a significant correlation between number of ...
Saturday, November 26, 2011 at 11:46am

statistics
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 20 to be 115 or more?
Friday, November 25, 2011 at 11:01pm

ELEMENTARY STATISTICS
50 MATH PROFESSORS WERE ASKED HOW LONG IT TAKES TO GRADE A STUDENT'S HOMEWORK ASSIGNMENT. THE MEAN GRADING TIME FOR THE SAMPLE WAS 36.2 MINUTES WITH A STANDARD DEVIATION OF 4.8 MINUTES. WHAT IS THE 99% CONFIDENCE INTERVAL FOR THE MEAN GRADING TIME OF ALL MATH PROFESSORS?
Friday, November 25, 2011 at 3:59pm

statistics
what is the standard deviation using the rule of thumb for the following set? 57 61 57 57 58 57 61
Friday, November 25, 2011 at 1:01pm

Statistics
Assume there are two lakes containing trout and the weights of the trout in each lake are normally distributed. The distribution of trout weight in Lake A has a mean of 18 ounces with a standard deviation of 2 ounces. The distribution of trout weight in Lake B has a mean of 19...
Thursday, November 24, 2011 at 11:09pm

Statistics
Suppose a tire manufacturer wants to set a mileage guarantee on its new XB 70 tire. Life tests revealed that the mean mileage is 47,900 miles and the standard deviation is 2,050. The manufacturer wants to set the guaranteed mileage so that no more than five percent of the ...
Thursday, November 24, 2011 at 11:08pm

Statistics
What will adding 50 to each score in a distribution do to the standard deviation of that distribution?
Thursday, November 24, 2011 at 10:58pm

Statistics
9. A probability experiment has three possible outcomes, A, B, and C. If P(A) = 0.60 and P(B) = 0.20, then P(C) = ______.
Thursday, November 24, 2011 at 10:57pm

Statistics
8. What will adding 50 to each score in a distribution do to the standard deviation of that distribution? will not change the standard deviation will increase it by 50 will increase it by 502 will not change it but will increase the variance
Thursday, November 24, 2011 at 10:54pm

Statistics
A loaded die is tossed. Which of the following assignments could be made for the probabilities of each simple outcome. P(1) = .2 P(2) = .2 P(3) = .2 P(4) = .1 P(5) = .1 P(6) = .1 P(1) = .2 P(2) = .3 P(3) = .1 P(4) = .1 P(5) = .1 P(6) = .0 P(1) = .1 P(2) = .1 P(3) = .1 P(4) = ....
Thursday, November 24, 2011 at 10:54pm

Statistics
The grades for Economics students at a large university are found to be normally distributed with a mean of 76 and a standard deviation of 4. What proportion of the students are expected to have a grade between 84 and 88?
Thursday, November 24, 2011 at 10:52pm

Statistics
The lifetimes of batteries produced by a firm are known to be normally distributed with a mean of 100 hours and a standard deviation of 10 hours. What is the probability a battery will last between 110 and 120 hours?
Thursday, November 24, 2011 at 10:48pm

statistics
how to interpret two diffrent mean and standard deviation ??????????????
Thursday, November 24, 2011 at 7:11pm

statistics
570 people were in a survey and 124 people said yes. What proportion of people said yes to 1 d.p
Thursday, November 24, 2011 at 12:54pm

statistics
In 2005, about 233 million people in the United States were aged 14 or older. They consumed, on average, 2.23 gallons of alcohol per person. use scientific notation to estimate the total number of gallons of alcohol consumed by this age group.
Wednesday, November 23, 2011 at 10:33pm

statistics
Let X be the average of a sample of size 25 independent normal random variables with mean 0 and variance 1. P[[X<c]=0.5 (a) Determine c such that (b) Now assume that the observations may not be normally distributed, but they still are independent with mean 0 and variance 1...
Wednesday, November 23, 2011 at 11:17am

statistics
The following data on the number of iron workers in the United States for the years 1978 through 2008 are provided by the U.S. Bureau of Labor Statistics. Using regression techniques discussed in this section, analyze the data for trend. Develop a scatter plot of the data and ...
Tuesday, November 22, 2011 at 7:47pm

statistics
x= 70 115 105 82 93 125 88 y= 3 45 21 7 16 62 12 compute r using the computation formula nearest thousandth
Tuesday, November 22, 2011 at 3:57pm

statistics
x= 70 115 105 82 93 125 88 y= 3 45 21 7 16 62 12 compute r using the computation formula nearest thousandth
Tuesday, November 22, 2011 at 3:54pm

Statistics
4) The table below shows the study times and test scores for a number of students. Study Time (minutes) (x) 9 16 21 26 33 Test Score (y) 59 61 64 65 73 a)What line best relates study time to the test score? b)Calculate r and r^2. c)Determine whether r is statistically ...
Tuesday, November 22, 2011 at 2:48pm

statistics
Some test use a median of 50 and a standard deviation of 10. What proportion of the population will be between the standard score of 90 and 110?
Tuesday, November 22, 2011 at 2:15pm

Statistics
A battery manufacturer is positive that its AA batteries last for 1,000 hours. However, you’re working for Consumer Reports and you don’t agree with what they say about their product. So, you buy 400 batteries and you test them out. Your findings are that the ...
Tuesday, November 22, 2011 at 12:54pm

statistics
2)A political candidate is positive that she will get 60% of the vote in an upcoming election. A sample of 100 people is taken, and 52 say that they will they will vote for her. Using a 5% significance level, is the politician right in her claim?
Tuesday, November 22, 2011 at 12:41pm

statistics
Using our data set from Unit 1, compose a 3-page e-mail to the head of the American Intellectual Union, which includes the following: 1.Begin your e-mail to AIU by first providing an overview of the database, that is, a story about the characteristics that may include types of...
Tuesday, November 22, 2011 at 9:26am

statistics
If a company is thinking of giving one department a 1000 bonus. Based on their means and standard deviation scores which set of employess will do better based on this information? Who should get the bonus? Employee A mean 16.875 standard deviation 4.45413 Employee B mean 12....
Tuesday, November 22, 2011 at 9:14am

health care
What is the difference between descriptive and inferential statistics? Provide example how you could apply both in your work environment
Tuesday, November 22, 2011 at 12:07am

statistics
Mary has already spent 1 minute on the phone, and she expects to spend 4 more minutes with every phone call she routes. In all, how many phone calls does Mary have to route to spend a total of 5 minutes on the phone? Write and solve an equation to find the answer.
Monday, November 21, 2011 at 8:54pm

statistics
Chicken Delight claims that 91 percent of its orders are delivered within 10 minutes of the time the order is placed. A sample of 70 orders revealed that 60 were delivered within the promised time. At the .02 significance level, can we conclude that less than 91 percent of the...
Monday, November 21, 2011 at 8:01pm

statistics
What does 60 over 75 equal
Monday, November 21, 2011 at 4:46pm

statistics
In a recent survey in a Statistics class, it was determined that only 60% of the students attend class on Thursday. From past data it was noted that 98% of those who went to class on Thursday pass the course, while only 20% of those who did not go to class on Thursday passed ...
Monday, November 21, 2011 at 1:05pm

statistics
A test was conducted and the students obtained the following scores; 18%, 28%, 30%, 50%, 56%, 64%, 64%, 70%, 72% and 84%. What statistical analysis method will be better to analyse this scores and please analyse it
Monday, November 21, 2011 at 1:33am

statistics
Group the largest data set and find mean, median, mode, variance, standard deviation, 15-th, 45-th and 80-th percentiles of the grouped data. Then find the same sample statistics using the ungrouped data. Is there any difference? Comment.
Sunday, November 20, 2011 at 8:56am

statistics
Find 10-th, 60-th and 75-th percentiles in each of your data set, then write down each value that corresponds to those percentiles. Now use those values to find sample percentiles empirically (Suppose value “a” corresponds to 10-th percentile in my data set. After ...
Sunday, November 20, 2011 at 8:55am

statistics
An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings. The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What is the...
Saturday, November 19, 2011 at 8:57pm

statistics
the company is concerned that a simple random sample of 2000 owners would include fewer than 12 owners of model d or fewer than 12 owners of model e. briefly describe a sampling method for randomly selecting 2000 owners that will ensure at least 12 owners will be selected for ...
Saturday, November 19, 2011 at 5:39pm

psych/statistics
Consider the following: The television network you addressed in Week 4 is asking you to compare the moods of groups that watch different types of shows. You can choose what they mean by moods. You may compare them on general mood, happiness, depression, frustration, or ...
Saturday, November 19, 2011 at 2:17pm

Statistics
are the following statements, Ho:=10 and Ha:equal to or less than, a valid pair of null and alternative hypothesis?assume that in a hypothesis test with null hypothesis Ho : u = 12.0 at a = 0.10, that a value of 16.0 for the sample mean results in the null hypothesis being ...
Saturday, November 19, 2011 at 1:28pm

statistics
cost of producing is 50 cents each and they sell for 1.25 each. demand for programs at each game is normally distributed with a mean of 2500 and standard deviation if 200. how many shouild be prodcued
Saturday, November 19, 2011 at 9:22am

Statistics
A researcher is interested in whether students who attend private high schools have higher average SAT scores than students in the general population. A random sample of 90 students at a private high school is tested and has a mean SAT score of 1050. The average score for ...
Saturday, November 19, 2011 at 8:23am

statistics
A student is taking a multiple choice exam. There are five possible answers for each question. What is the probability the student will answer the first question correctly? What is the probability that the student will answer the first question incorrectly?
Saturday, November 19, 2011 at 1:30am

statistics
can you place 44 coins in 10 containers and have them distributed evenly
Friday, November 18, 2011 at 8:14am

statistics
If on an average, one ship out of 10 is wrecked. Find the probability that out of five ships expected to arrive the post at least four wil arrive safely.
Friday, November 18, 2011 at 12:53am

statistics
poisson distribution: please show and solve. # of purchases in the next 24 hours.
Thursday, November 17, 2011 at 8:57pm

statistics
1. A state’s department of education reports that 12% of the high school students in that state attend private schools. The state university wonders if the percentage is the same in their applicant pool. Admissions officers plan to check a random sample of the over 10,000...
Thursday, November 17, 2011 at 7:00pm

statistics
3. Use the following SAT score data to answer the questions that follow. Gender Verbal Math M 600 690 M 610 550 F 490 800 F 680 610 M 520 540 F 680 660 M 650 700 M 600 560 F 550 560 M 490 390 F 530 530 M 560 560 F 630 590 F 510 520 M 710 740 F 550 560 M 690 620 M 700 700 M 540...
Thursday, November 17, 2011 at 6:59pm

statistics
The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that at least 175 homes are going to be used as investment property
Thursday, November 17, 2011 at 5:54pm

Statistics
Olive-Oil producers have expanded to approximately 120 producers statewide. Analysts estimate the average price consumers pay for a bottle of olive oil is $21, with a standard deviation of $2.40. What is the probability that the average price paid by a random sample of 36 ...
Thursday, November 17, 2011 at 1:30pm

statistics/psych
Find TWO media examples of two types of correlations (explained below). You will have to do some research to find these. Next: (1) Find one media example (don�t make up your own) of a correlation that could be argued to be spurious (third variable). Explain your media ...
Wednesday, November 16, 2011 at 6:36pm

statistics/psyc
Researchers are interested in the effectiveness of a particular treatment for insomnia. Fifty insomnia sufferers who responded to a newspaper ad are contacted, and each is given a pill with instructions to take it before going to sleep that night. The pill actually contains ...
Wednesday, November 16, 2011 at 6:35pm

Statistics
a machine fills containers with a standard deviation of filling weights of 1.5. calculate the mean weight if only 4 % of the containers hold less than 19 ounces
Wednesday, November 16, 2011 at 3:30pm

English Check
Write a paragraph explaining why you think it is a suitable topic for a research paper, based on your research questions. What are the risks of using cell phones when driving? How will the police control people from violating this law? will banning cellphones while driving ...
Wednesday, November 16, 2011 at 1:58pm

statistics
Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson’s psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean µ = 5.2 hours and...
Wednesday, November 16, 2011 at 1:37pm

statistics
which is a valid probability function a) p(x) for x=0,1,2 b)p(x)=x/1 for 0,1,2 c) p(x)=x/2 for 0,1,2
Wednesday, November 16, 2011 at 1:03pm

statistics
1. Here are the actual tabulated demands for an item for a nine-month period (January through September). Your supervisor wants to test two moving average forecasting methods to see which one was better over this period.
Wednesday, November 16, 2011 at 9:50am

Statistics
There are 200 students in a sample. How many of these students will have scores that fall under the score of 41? Mean is 45, standard dev. is 4.
Tuesday, November 15, 2011 at 9:16pm

Anthropology11
what are some canadian statistics on generalized anxiety disorder?
Tuesday, November 15, 2011 at 7:58pm

statistics
A business researcher wants to estimate the average number of years of experience an account manager has working with the company before getting promoted to account manager. Eight account managers are randomly selected and asked how long they worked with the company before ...
Tuesday, November 15, 2011 at 7:11pm

statistics permutations and combinations
Selecting a committee: There are 7 women and 5 men in a department. How many ways can a committee of 4 be selected if there must be at least 2 women?
Tuesday, November 15, 2011 at 4:52pm

statistics
the times required to assemble a product part are normally distributed with a mean of 54.4 minutes & a standard deviation of 5.2 minutes. What fraction of the assemble workers require more than one hour?
Tuesday, November 15, 2011 at 1:17pm

statistics
which of the following statements is true? Justify your answer with an example. i)When the margin of error is small, the confidence level is high. ii)When the margin of error is small, the confidence level is low. iii)A confidence interval is a type of point estimate. iv) A ...
Tuesday, November 15, 2011 at 7:22am

statistics
Ram earned a score of 940 on a national achievement test. The mean test score was 850 with a standard deviation of 100.what proportion of student had a higher score than Ram?(Assume that test scores are normally distributed)
Tuesday, November 15, 2011 at 7:21am

statistics
In a state,52%of the voters supports party-R, and 48% supports party-D. In second state 47% of the voters supports party-D. Suppose 100 voters are surveyed from each state. Assume the survey uses simple random sampling. what is the probability that the survey will show a ...
Tuesday, November 15, 2011 at 7:21am

statistics
. As a part of their customer-service program, United Airlines wanted to select 10 passengers from today's 9 A.M. Chicago-Tampa flight to be interviewed regarding airport facilities, service, and amenities in the waiting area. Each passenger was given a number on check in...
Monday, November 14, 2011 at 5:24pm

statistics
A student took a 25 question true and false test answering the question randomly without reading. If a score of 18 is correct is the minimum passing graade, how likely is it that the random guesser will pass the test? This is binomial although there is a slight twist in the Q
Monday, November 14, 2011 at 2:32pm

statistics
the property restoration company is considering switching to new degumidifiers. Their market research, considering the cost of the4 new machines and their efficiency, tells them that the switch would give them a 96% chance of making a $20,000 profit, a 1% chance of breaking ...
Monday, November 14, 2011 at 1:08pm

statistics
If there are 200 students in a sample, and the mean = 45 and the standard deviation = 4. How many of these students will have a score under 41?
Monday, November 14, 2011 at 3:34am

statistics
based on a random sample of 640 college students, the mean amount of sleep college students. construct a 95% confidence interval for the mean amount of sleep per night for college studenrs.
Sunday, November 13, 2011 at 10:21pm

statistics
Given a normal distribution of scores with a mean of 100 and a SD of 10, compute z scores for the following raw valves: 95, 115, 80, 130.
Sunday, November 13, 2011 at 8:23pm

statistics
A new restaurant with 123 seats is being planned. Studies show that 63% of the customers demand a smoke free area. How many seats sould be in the non-smoking area in order to be very sure (mean+3StandardDeviation) of having enough seating there?
Sunday, November 13, 2011 at 6:39pm

statistics
The heights in inches of 14 randomly selected adult males in LA are listed as: 71, 67, 70, 59, 71, 68, 67, 71, 80, 68, 74, 69, 72, 68. 1. Display the data in a stem-and-leaf plot. 2. Find the mean. 3. Find the median. 4. Find the mode. 5. Find the range. 6. Find the variance. ...
Sunday, November 13, 2011 at 3:58pm

statistics
e Chebyshev’s theorem to find what percent of the values will fall between 226 and 340 for a data set with a mean of 283 and standard deviation of 19.
Sunday, November 13, 2011 at 12:54pm

STATISTICS
Pure Plastics Inc. manufacture molded plastic pieces. A sample of their raw material inventory is shown in the table below: Item Average Inventory (units) Value ($/unit) 128 400 3.75 234 300 4.00 233 120 2.50 236 75 1.50 239 60 1.75 240 30 2.00 678 20 1.15 784 12 2.05 821 8 1....
Sunday, November 13, 2011 at 9:20am

statistics
Why should we check if your data is binomial?
Sunday, November 13, 2011 at 8:39am

Statistics
University Hospital has been concerned with the number of errors found in its billing statements to patients. An audit of 100 bills per week over the past twelve weeks revealed the following number of errors: Week Number of Errors 1 4 2 5 3 6 4 6 5 3 6 2 7 6 8 7 9 3 10 4 11 3 ...
Saturday, November 12, 2011 at 5:48pm

statistics
Chapter 06, Problem 8 A tire manufacturer has been concerned about the number of defective tires found recently. In order to evaluate the true magnitude of the problem, a production manager selected ten random samples of twenty units each for inspection. The number of ...
Saturday, November 12, 2011 at 5:46pm

statistics
On average, 30-minute television sitcoms have 22 minutes of programming.If a probability distribution for minutes of programming can be approximated by a uniform distribution from 18 minutes to 26 minutes. What is the probability a sitcom will have 25 or more minutes of ...
Friday, November 11, 2011 at 11:20pm

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