The Mann-Whitney U test, the Wilcoxon signed rank test, and the Kruskal-Wallis test
A) all are forms of chi-square tests.
B) are preferred when the research data are rank or interval scores that grossly violate parametric assumptions of normal distribution and homogeneity of variance.
C) are used to compare the score distributions of three or more groups.
D) all of the above.

Question

Quizplus · Accepted Answer

These tests are non-parametric alternatives to traditional parametric tests, used when data do not meet the assumptions of normal distribution and equal variances. The Mann-Whitney U test compares two independent groups, the Wilcoxon signed-rank test compares two related samples, and the Kruskal-Wallis test compares three or more independent groups, all without assuming a normal distribution of the data.

The Mann-Whitney U Test, the Wilcoxon Signed Rank Test, and the Kruskal-Wallis