The nonparametric tests discussed in your book (Wilcoxon rank sum test, sign test, Wilcoxon signed rank test, Kruskal-Wallis test and Friedman test) all require that the probability distributions be:
A) identical except with respect to location
B) identical except with respect to spread (variance)
C) identical except with respect to shape (distribution)
D) different with respect to location, spread, and shape
E) different with respect to location

Question

Quizplus · Accepted Answer

Nonparametric tests do not assume a specific distribution form but often require that the distributions of the groups being compared are identical except for a shift in location. This allows for comparisons of median values without assuming normal distribution.

The Nonparametric Tests Discussed in Your Book (Wilcoxon Rank Sum