Assume That We Asked 20 Subjects to Participate in a Smoking

Multiple Choice

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.