Which of the following correctly describes the Wilcoxon rank-sum test?
a. It is a nonparametric test based on two independent simple random samples.
b. It is designed to determine whether the relative frequency distributions of two statistical populations of continuous values are identical to or different from one another.
c. It is equivalent to a parametric t-test of the difference between two means.
d. All of these.
e. None of these.
Question 2
Inferential procedures that are free from restrictive assumptions about the sampled populations are known as:
a. distribution-free tests (because no assumption about the nature of the population distribution is being made)
b. distribution-free tests (because no assumption about the nature of the sampling distributions of test statistics is being made)
c. parametric tests
d. all of these
e. none of these
(A) Scratch test; patient is exposed to allergens through a light scratch on the skin; (B) Positive
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