Mann-Whitney U Test

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The Mann-Whitney U test, also known as the Mann-Whitney-Wilcoxon test, is a non-parametric statistical test used to determine whether two independent groups differ significantly in their medians. It is suitable for ordinal or continuous data that do not meet the assumptions required by parametric tests like the t-test. The test ranks all data points from both groups together, compares the ranks between the groups, and calculates a U statistic based on these ranks. A lower U value indicates that observations in one group tend to have higher ranks than in the other group, suggesting a significant difference. A non-parametric test used to compare differences between two independent groups when the dependent variable is either ordinal or continuous, but not normally distributed.