Which of the following refers to a nonparametric method to compare two populations,when the samples are independent and the data are either ordinal or interval,and where the normality requirement necessary to perform the parametric test is not satisfied? A)Sign test B)Wilcoxon signed rank test C)Equal-variance t-test of μ₁ - μ₂ D)Wilcoxon rank sum test or Mann-Whitney test

Question

Quizplus · Accepted Answer

The Wilcoxon rank sum test (also known as the Mann-Whitney test) is a nonparametric method used to compare two independent populations when the data are either ordinal or interval but do not meet the normality assumption needed for a parametric test. The other options, the sign test and Wilcoxon signed-rank test, are appropriate for paired data, not independent samples. The third option, the equal-variance t-test, assumes normality of the data and equal variances, so it is not appropriate for non-normal data.

Which of the Following Refers to a Nonparametric Method to Compare