The non-parametric equivalent of the unpaired t-test, used when data is not normally distributed, is:
- A Mann-Whitney U test ✓
- B Wilcoxon signed-rank test
- C Kruskal-Wallis test
- D Friedman test
Correct answer: A. Mann-Whitney U test
Explanation
The Mann-Whitney U test (also called Wilcoxon rank-sum test) is the non-parametric equivalent of the unpaired t-test, used for comparing medians of two independent non-normal samples. The Wilcoxon signed-rank test is the non-parametric equivalent of the paired t-test. Kruskal-Wallis is the non-parametric equivalent of one-way ANOVA (3+ groups). Friedman test is the non-parametric equivalent of repeated measures ANOVA.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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