The non-parametric tests discussed in your textbook (Wilcoxon rank sum test, sign test, Wilcoxon signed rank sum 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.

Question

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Non-parametric tests like the Wilcoxon rank sum test, sign test, Wilcoxon signed rank sum test, Kruskal-Wallis test, and Friedman test assume that the probability distributions are identical except for differences in location (central tendency).

The Non-Parametric Tests Discussed in Your Textbook (Wilcoxon Rank Sum