A nonparametric method to compare two populations,when the samples are matched pairs and the data are quantitative where the normality requirement necessary to perform the parametric test is unsatisfied,is the:
A) the Wilcoxon rank sum test.
B) the Friedman test.
C) the Kruskal-Wallis test.
D) the Matched pairs t-test.
E) the Wilcoxon signed rank test.

Question

Quizplus · Accepted Answer

The Wilcoxon signed rank test is the appropriate nonparametric method to use when comparing two populations with matched pairs of quantitative data and where the normality assumption is not met. This test is based on the differences between the pairs of observations, and does not require the population distributions to be normal.

A Nonparametric Method to Compare Two Populations,when the Samples Are