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A consumer organization wants to know whether there is a difference in the price of a particular toy at three different types of stores.The price of the toy was checked in a sample of five discount stores, five variety stores, and five department stores. The results are shown below. Use the .05 significance level.
Discount Variety Department$12 $15 $19
13 17 17
14 14 16
12 18 20
15 17 19
What is the probability that he will answer all questions correctly?
Construct a 95 percent confidence interval for the true mean.
If employee is chosen at random, determine the probability that employee is female and salaried staff? Choose the best answer from the following.
The times needed to fall asleep are assumed to follow a normal distribution. The results for the two nights for the ten volunteers are shown below:
How would you use the binomial distribution in making a business decision during a normal day of work in the career of your choice?
You are planning to test a vaccine for a virus that has no vaccine. Since the disease is usually not serious, you will expose 100 volunteers to the virus. After some time, you will record whether or not each volunteer has been infected.
A study of 36 members of the Central Park Walkers showed that they could walk at an average rate of 2.6 miles per hour. The sample standard deviation is 0.4. Find the 95% confidence interval for the mean for all walkers.
Four different paints are advertised as having the same drying time. To check the manufacturer's claims, five samples were tested for each of the paints.
What is the probability that the mean price for a sample of 30 service stations is within $.03 of the population mean (to 4 decimals)?
Calculate the 95% confidence interval for the proportion of students with at least one injury for each of the two subpopulation
Collapse the response categories in the following tables so that it meets the assumptions of the chi-square test; than perform the test.
A company wants to know if minorities are more likely to be in certain job categories than others. Their data base codes employees 1 for clerical, 2 for custodial, and 3 for manager. A logistic equation was fit to the data with SPSS.
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