A drug was developed for reducing cholesterol levels in heart patients. The cholesterol levels before and after drug treatment were obtained for a random sample of 25 heart patients with the following results:

a. Use the sign test to determine whether or not this drug reduces the cholesterol levels of heart patients. Use α = .01.

b. Use the Wilcoxon signed-rank test to test the hypothesis in part a at the 1% level of significance. Are your conclusions the same as those in part a?

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