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27 Practice Questions

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BUAD 310 Applied Business Statistics In-Class Practice 9/27/10 Standard Normal Table 2

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t Table 3 Trash bag case: a marketer of trash bags wants to use hypothesis testing to support its claim that the mean breaking strength of its new trash bag is greater than 50 pounds. A sample of 40 new trash bags is randomly selected for which the mean breaking strength is calculated to be 50.575. Conduct hypothesis test assuming that the population SD is known to be 1.65. 4
Trash bag case: a marketer of trash bags wants to use hypothesis testing to support its claim that the mean breaking strength of its new trash bag is greater than 50 pounds. A sample of 40 new trash bags is randomly selected for which the mean breaking strength is calculated to be 50.575. Conduct hypothesis test using the fact that the sample SD is 1.6438. 5 In 1991 the average interest rate charged by U.S. credit card issuers was 18.8%. Since that time, there has been a proliferation of new credit cards. We want to study whether the increased competition in

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