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Question: For each of the following, state the null hypothesis and the alternative hypothesis.
a) The publisher of Celebrity Living claims that the mean sales for personality magazines featuring people such as Angelina Jolie or Paris Hilton is at least 1.5 million per week. A sample of 10 comparable titles shows that the mean weekly sales last week were 1.3 million. The publisher's claim is to be verified.
b) The manager of Little Cakes Inc. states that an average of 1500 muffins is sold each week in the retail store. One of the bakers feels that the average is less than 1500, and decides to test this claim.
c) For the past three years, an insurance company has stated that its average claim amount is $2000. The manager feels that this amount should be updated and takes a sample of 55 claims to see if there is a difference in the average claim amount.
d) A machine on a production line is set to automatically fill each bottle with 500 mL of water. The quality control manager regularly takes random samples of the bottles from the production line to ensure that the machine is filling the bottles correctly, If not, the machine will need adjusting.
Calculate the test statistic (z-score) for the sample. What deccision should be made about the null hypothesis, and what decision should be made about the effect of the program.
Using the following information, find the equation of the regression line, and predict the heart rate when 0.27 milligrams of the drug is used.
The table shows the retail market share of passenger cars from Ford Motor Company as a percent of the US market.
Determine the Midrange. Determine the Standard Variance. Determine the Standard Deviation
What is the probability that the sample proportion is less than 0.5? What is the upper limit of the sample proportion such that only 3%of the time the sample proportion would exceed this value
In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected for a sample of 49 customers. At 95% confidence, what is the margin of error (to 1 decimal)?
Analyze the data using linear contrasts to make the following comparisons:
A random sample of 22 service times (in minutes) gives s-square = 8. Give a 95% confidence interval for the variance of service time at the bank.
What is the age distribution of adult shoplifters (21 years of age or older) in supermarkets? The following is based on information taken from the National Retail Federation.
A survey of 500 internet users found that the users were online an average of 6.5 hours a week with a standard deviation of 3.1 hours. If 49 internet users are randomly selected what is the probability that their average time online will be more t..
What is a probability notation? What are the advantages and disadvantages of using a probability notation? How does probability notation aid in decision making?
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. A sam..
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