Answer Happy

Class Assignment: Chapter 8: Problem # 1: 7. Perform the indicated test of hypotheses, based on the information given. C. Test Ho : u = 24 vs. He : u # 24@a = 0.02, unknown, n = 50, F = 22.8,5 - 1.9
Problem # 2: 13. An automobile manufacturer recommends oil change intervals of 3,000 miles. To compare actual intervals to the recommendation, the company randomly samples records of 50 oil changes at service facilities and obtains sample mean 3,752 miles with sample standard deviation 638 miles. Determine whether the data provide sufficient evidence, at the 5% level of significance, that the population mean interval between oil changes exceeds 3,000 miles.
Problem # 3: 19. The mean household income in a region served by a chain of clothing stores is $48,750. In a sample of 40 customers taken at various stores the mean income of the customers was $51,505 with standard deviation $6,852. a. Test at the 10% level of significance the null hypothesis that the mean household income of customers of the chain is $18,750 against that alternative that it is different from $18,750. b. The sample mean is greater than $48,750, suggesting that the actual mean of people who patronize this store is greater than $48,750. Perform this test, also at the 10% level of significance. (The computation of the test statistic done in part (a) still applies here.)
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