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13 In a study to investigate the effects of regular exercise on raising high density...

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13 In a study to investigate the effects of regular exercise on raising high density lipoprotein HDL cholesterol levels good cholesterol a random sample of five male subjects known to have low HDL levels had their HDL measured at the beginning of the study and then again after six months on a regular exercise schedule The data are given in the following table Subject Initial HDL HDL after 6 months Difference 1 31 39 8 c n 8 d n 10 2 36 32 4 3 32 44 12 4 28 34 6 5 37 39 2 The data are to be analyzed using the Wilcoxon signed rank test What is the effective sample size n to be used when calculating the test statistic a n 4 b n 5 14 At The researcher is interested in testing the following one sided test Ho Initial and final HDL measurements have the same distribution H Final HDL levels are systematically lower If the standardized value of Wt is z 1 48 What is the P value for the Wilcoxon signed rank test W a 0 0281 b 0 0329 c 0 0495 d 0 0694

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