The nonparametric tests discussed in your book (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 shape (distribution).
b. identical except with respect to spread (variance).
c. identical except with respect to location.
d. different with respect to location, spread, and shape.
C
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