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

Short Answer

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: $\begin{array}{|l|l|}\hline A&\text {identical except with respect to location. }\\\hline B&\text {identical except with respect to spread (variance). }\\\hline C&\text {identical except with respect to shape (distribution). }\\\hline D&\text { different with respect to location, spread, and shape.}\\\hline \end{array}$