Mann-Whitney U Test (Wilcoxon Rank-Sum Test) – Practice Quiz

Compare two independent samples using Mann-Whitney U and the Wilcoxon rank-sum statistic. Prerequisites: pooled ranks, exchangeability and hypothesis testing. Compute rank sums, pairwise ordering effects, complementary U values and null approximations; examine ties, directional claims, sample imbalance and exact label allocations. Analytical questions separate distributional evidence from median-shift and causal interpretations.

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