Assume that we asked 20 subjects to participate in a smoking cessation study. We recorded their craving for a cigarette before and after applying a nicotine patch. One reason we might want to use a distribution-free test is because
a. we have too few subjects for a parametric test.
b. there are some outliers that we don't want to have undue influence on the results.
c. the data are normally distributed.
d. the subjects are all male.
B
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