A non-parametric alternative to the independent samples t-test for two unpaired groups with non-normal data distribution is:
- A Kruskal-Wallis test
- B Mann-Whitney U test ✓
- C Wilcoxon signed-rank test
- D Spearman's rho
Correct answer: B. Mann-Whitney U test
Explanation
Mann-Whitney U test (also called Wilcoxon rank-sum test) is the non-parametric equivalent of the unpaired (independent samples) t-test. Kruskal-Wallis is the non-parametric equivalent of one-way ANOVA. Wilcoxon signed-rank test is the non-parametric equivalent of the paired t-test. Spearman's rho is a non-parametric correlation measure.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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