Select all that apply. A manufacturer of bedding wants to do quality control on

ID: 3053470 • Letter: S

Question

Select all that apply. A manufacturer of bedding wants to do quality control on its 400-thread- count sheets. The thread count varies normally with a mean thread count ? = 400 and a standard deviation ?-8. A quality control researcher randomly selects 16 sheets and finds that the mean thread count for the sample is 395.2. 10 points In this problem, we have made slight changes to the "sheet thread count" story in previous questions. In which of the following options is the change such that it would be inappropriate to conduct a hypothesis test (e.g., z-test for the population proportion, z-test for the population mean, or t-test for the population mean) for Ho: ? = 400 vs. Ha: ? = 400? Check all that apply. A. OA manufacturer of bedding wants to do quality control on its 400-thread-count sheets. The thread count has a mean thread count ?-400 and a standard deviation ?-8. A quality control researcher randomly selects 16 sheets and finds that the mean thread count for the sample is 395.2 B. O A manufacturer of bedding wants to do quality control on its 4oo-thread-count sheets The thread count has a mean thread count ?-400 and a standard deviation ? 8. A quality control researcher randomly selects 50 sheets and finds that the mean thread count for the sample 1S 395.2. C. OA manufacturer of bedding wants to do quality control on its 40o-thread-count sheets The thread count varies normally and has a mean thread count u - 400. A quality control researcher randomly selects 16 sheets and finds that the mean thread count for the sample is 395.2 with a standard deviation of 8. D. O A manufacturer of bedding wants to do quality control on its 400-thread-count sheets The thread count has a mean thread count ? = 400. A quality control researcher randomly selects 16 sheets and finds that the mean thread count for the sample is 395.2 with a standard deviation of 8.

Explanation / Answer

If it is not given that the population is normally distributed then the sample size should be greater than 30 to apply z or t test.

Here in Options A and D, the population distribution is not certain and sample size is less than 30. So these are the cases in which the tests would not be applicable.

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Select all that apply. A manufacturer of bedding wants to do quality control on

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