A Non-Parametric Method to Compare Two or More Populations, When

Short Answer

A non-parametric method to compare two or more populations, when the samples are matched pairs and the data are either ordinal or interval but not normal, is the: $\begin{array}{|l|l|}\hline A&\text {Wilcoxon signed rank sum test. }\\\hline B&\text { sign test.}\\\hline C&\text { Friedman test.}\\\hline D&\text {Kruskal-Wallis test. }\\\hline \end{array}$