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July 30, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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statistics
The scatter diagram of midterm scores and final scores in a large class is football shaped. For about 80% of the students, the regression estimate of final score based on midterm score is correct to within 15 points. For about 95% of the students, the regression estimate of ...
Wednesday, March 27, 2013 at 9:40am

statistics
About 24% of all homes purchased on 2004 were considered investment properties. a random sample of 800 homes sold in 2004 is obtained. What is the probability that at most 200 homes are used as an investment property?
Tuesday, March 26, 2013 at 10:38pm

Statistics
A pharmaceutical company claims its new medication relieves painful symptoms caused by tension headaches within 15 minutes. To investigate this claim, a local health clinic conducts a study of 45 patients who suffer from chronic tension headaches. Each patient is given ...
Tuesday, March 26, 2013 at 8:58pm

Statistics
According to a recent pole only 21% of Americans were satisfied with the direction the U.S. is heading. To investigate the reliability of the report an independent polling organization surveyed 500 Americans and inquired as to whether or not they were satisfied with the way ...
Tuesday, March 26, 2013 at 8:58pm

Statistics
Assume the weights of men are normally distributed having a mean of 185 lbs and a standard deviation of 17 pounds. A. Calculate the probability a randomly selected man weights less than 225 lbs B. Approximately 72% of men’s weights exceed how many pounds. C. In a random ...
Tuesday, March 26, 2013 at 8:55pm

Statistics
Assume the wait time to see a cardiologist at a certain clinic are uniformly distributed between 7 minutes and 23 minutes. Calculate the probability a randomly selected patient waits at least 18 minutes to see the cardiologist. The random variable, Z, is associated with a ...
Tuesday, March 26, 2013 at 8:54pm

Statistics
A Manufacturer of torque converters claim only 1% of them are defective. A. Calculate the Mean number of defective converters in a shipment of 500 converters. B. Calculate the standard deviation in the defective torque converters in a shipment of 500 converters. C. Would it be...
Tuesday, March 26, 2013 at 8:53pm

Statistics
A Manufacturer of torque converters claim only 1% of them are defective. A. In a shipment of 12 torque converters calculate the probability exactly 2 converters are defective. B. In a shipment of 35 converters, calculate the probability at least 1 converter is defective.
Tuesday, March 26, 2013 at 8:52pm

Statistics
In a certain game of chance a person pays $5 to play a game. A person randomly selects 2 integers ranging from 0-99. The host of the game then uses a random number generator to select 2 integers ranging from 0-99. If the players values and hosts values agree (in any order), ...
Tuesday, March 26, 2013 at 8:03pm

Statistics
Use this information to calculate the mean and standard deviation of this random variable. P(x)- .25, .05, .55, .15
Tuesday, March 26, 2013 at 8:02pm

Statistics
A standard deck of 52 playing cards is composed of 4 suits. Each mix contains 13 cards. Jacks, Queens, and Kings are considered face cards. Assume three cards are selected without replacement. Calculate the probability of drawing two hearts, followed by a spade.
Tuesday, March 26, 2013 at 7:59pm

statistics
The National AIDS Behavioral Surveys interviewed a sample of adults in the cities where AIDS is most common. This sample included 782 heterosexuals who reported having more than one sexual partner in the past year. We can consider this an SRS of size 782 from the population of...
Tuesday, March 26, 2013 at 2:37pm

statistics
Us travel data center survey of 1500 adults found that 42% of respondents stated that they favor historical sites. Find the 95% confidence interval of the true proportion of all adults who favor visiting historical sites.
Monday, March 25, 2013 at 10:46pm

statistics
Confidence Intervals; In a survey of 1004 individuals, 442 felt that Randolph spent too much time away. Find a 95% confidence interval for the true population proportion
Monday, March 25, 2013 at 10:24pm

math
At the Statistics Canada Web site, you can find the percent of adults in each province or territory who have at least a university certificate, diploma, or degree at bachelor's level or above. It makes no sense to find x bar for these data and use it to get a confidence ...
Monday, March 25, 2013 at 9:03pm

statistics
Consider the probability that less than 13 out of 151 CDs will be defective. Assume the probability that a given CD will be defective is 12%
Monday, March 25, 2013 at 5:04pm

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 Σ X² = 92 T=2 T=6 T=16 SS=3 SS=9 SS=6 Use an analysis of variance with α of .05 to determine ...
Monday, March 25, 2013 at 3:48pm

statistics
The average amount spent at a fast-food restaurant in California was $3.30, with a standard deviation of $.40. Yet in Georgia, the average amount spent at a fast-food restaurant was $3.25, with a standard deviation of $.10. What do these statistics tell you about fast-food ...
Monday, March 25, 2013 at 2:17pm

english
Below is a list of facts and statistics that can be used to support a topic sentence. Use the list to complete the following unfinished paragraph given below. It already has a topic sentence. Facts and Statistics: 980,299 registered purebred dogs; does not include non-purebred...
Monday, March 25, 2013 at 2:13pm

statistics
Are Chicken based dishes more populat than Pizza to a level which is statistically significant at the 95% confidence level? What figures do i have to look at to work it out? Thanks
Monday, March 25, 2013 at 5:07am

statistics
the manufacturer of a popular brand of tv set claims that 95 percent of its sets last at least 5 years without requiring a single repair. a sample of 8 purchasers of these tv sets was selected at random from a list of purchasers five years earlier. use this information to ...
Sunday, March 24, 2013 at 10:38pm

statistics
The average homicide rate for the cities and towns in a state is 10 per 100,000 population with a standard deviation of 2. If the variable is normally distributed, what is the probability that a randomly selected town will have a homicide rate greater than 14?
Sunday, March 24, 2013 at 8:37pm

statistics
The grades on the final examination given in a large organic chemistry class are normally distributed with a mean of 72 and a standard deviation of 8. The instructor of this class wants to assign an “A” grade to the top 10% of the scores, a “B” grade to the...
Sunday, March 24, 2013 at 5:22pm

statistics
solve this math statistic problem: an insurance company insures a person's antique coin collection worth $20,000 for an annual premium of $300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's expected profit?
Sunday, March 24, 2013 at 11:54am

statistics
In a recent study on gender differences in education, a sample of 7 boys had a mean score of 18.5 and a standard deviation of 4.1 on a Standardized Math Test. A sample of 11 girls had a mean score of 19.9 and a standard deviation of 3.6 on the same test. What is the t-...
Sunday, March 24, 2013 at 1:31am

statistics
two spot available and there is 6 men and 4 women what is the probability that a women will be picked?
Friday, March 22, 2013 at 10:19pm

Statistics
A car rental agency currently has 41 cars available, 28 of which have a GPS navigation system. Two cars are selected at random from these 41 cars. Find the probability that both of these cars have GPS navigation systems
Friday, March 22, 2013 at 10:06pm

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

Business Stats
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

business statistics
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

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