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The federal government awarded grants to the agricultural departments of 9 universities to test the yield capabilities of two new varieties of wheat. Each variety was planted on a plot of equal area a...
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The following data represent the running times of films produced by two motion-picture companies. Compute a 90% confidence interval for the difference between the average running times of films prod...
See AnswerQ: Fortune magazine (March 1997) reported the total returns to investors
Fortune magazine (March 1997) reported the total returns to investors for the 10 years prior to 1996 and also for 1996 for 431 companies. The total returns for 10 of the companies are listed below. Fi...
See AnswerQ: An automotive company is considering two types of batteries for its automobile
An automotive company is considering two types of batteries for its automobile. Sample information on battery life is collected for 20 batteries of type A and 20 batteries of type B. The summary stati...
See AnswerQ: Two different brands of latex paint are being considered for use.
Two different brands of latex paint are being considered for use. Fifteen specimens of each type of paint were selected, and the drying times, in hours, were as follows: Assume the drying time is no...
See AnswerQ: A random sample of 100 automobile owners in the state of Virginia
A random sample of 100 automobile owners in the state of Virginia shows that an automobile is driven on average 23,500 kilometers per year with a standard deviation of 3900 kilometers. Assume the dist...
See AnswerQ: Two levels (low and high) of insulin doses are given
Two levels (low and high) of insulin doses are given to two groups of diabetic rats to check the insulin binding capacity, yielding the following data: Low dose: n1 = 8 ¯x1 = 1.98 s1 = 0.51 High dose:...
See AnswerQ: In a random sample of 1000 homes in a certain city,
In a random sample of 1000 homes in a certain city, it is found that 228 are heated by oil. Find 99% confidence intervals for the proportion of homes in this city that are heated by oil using both met...
See AnswerQ: Compute 95% confidence intervals, using both methods on page 297
Compute 95% confidence intervals, using both methods on page 297, for the proportion of defective items in a process when it is found that a sample of size 100 yields 8 defectives.
See AnswerQ: (a) A random sample of 200 voters in a town
(a) A random sample of 200 voters in a town is selected, and 114 are found to support an annexation suit. Find the 96% confidence interval for the fraction of the voting population favoring the suit....
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