A Non-Parametric Method to Compare Two Populations, When the Samples

Multiple Choice

A non-parametric method to compare two populations, when the samples consist of matched pairs of observations and the data are either ordinal or interval, and where the normality requirement necessary to perform the parametric test is not satisfied, is the:

A) Wilcoxon rank sum test.
B) Chi-squared test.
C) Wilcoxon signed rank sum test.
D) Kruskal-Wallis test.