A Nonparametric Method to Compare Two Populations, When the Samples

Multiple Choice

A nonparametric method to compare two populations, when the samples are matched pairs and the data are interval, and where the normality requirement necessary to perform the parametric test is unsatisfied, is the:

A) Wilcoxon rank sum test
B) sign test
C) matched pairs t-test
D) Wilcoxon signed rank test
E) matched pairs z-test