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 non-parametric test is because:

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We have too many subjects for a parametric test

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The subjects are all male

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There are some outliers that we don’t want to have undue influence on the results

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The data are normally distributed

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Assume that we asked 20 subjects to participate in a smoking cessation study. We...

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