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.
Question 2
When we have relatively large sample sizes, the distribution-free tests for comparing two groups or sets of data discussed in the text have
a. a chi-square approximation.
b. a normal approximation.
c. no solution.
d. problems.
Aerial photo showing the placement of 24 study plots, each 50 m by 50 m, in the Chihuahuan Desert ne
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Model of a longitudinal study in which 983 students were surveyed in 1984 and then again in 1985, 19
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Results of a genome-wide association study (GWAS) to detect SNPs