A Nonparametric Method to Compare Two or More Populations,when the Samples

Multiple Choice

A nonparametric method to compare two or more populations,when the samples are matched pairs and the data are either ranked or quantitative but not normal is the:

A) Wilcoxon signed rank test.
B) Wilcoxon rank sum test.
C) Friedman test.
D) Kruskal-Wallis test.
E) Sign test for comparing paired samples.