Exam 2 Lecture Review

Exam 2 Lecture Review - Stats 350 Gunderson Exam 2 Lecture...

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Stats 350 Gunderson Exam 2 Lecture Review 1. In a study to investigate the effect of a special diet on reducing cholesterol levels, 12 subjects known to have high cholesterol had their cholesterol measured at the beginning of the study and again after 6 months on the special diet. Suppose you can assume that the differences in cholesterol (measured as before minus after ) are a random sample from some approximately normal population. Use a 5% significance level. a. State clearly the appropriate hypotheses to be tested. H 0 :_____________________________ H a :_______________________________ b. Suppose that the mean difference ( before minus after ) is 9 and the standard error of the mean difference is 6. Compute the corresponding test statistic (include its symbol and its value). Test statistic: _____ = ____________ c. Find the corresponding p -value for testing the hypotheses in part a. Show your work. -value: ___________________ d. Check the appropriate statistical decision and conclusion. ___ Reject H 0 ; there is insufficient evidence to demonstrate the special diet reduces cholesterol on average. ___ Reject H 0 ; the special diet does appear to reduce cholesterol on average. ___ Fail to reject H 0 ; there is insufficient evidence to demonstrate the special diet reduces cholesterol on average. ___ Fail to reject H

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This note was uploaded on 03/27/2008 for the course STAT 350 taught by Professor Gunderson during the Winter '08 term at University of Michigan.

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Exam 2 Lecture Review - Stats 350 Gunderson Exam 2 Lecture...

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