The Wilcoxon rank-sum test is a non-parametric statistical method used to compare the distributions of two independent samples. It assesses whether one sample tends to have larger or smaller values than the other, making it useful when the data does not meet the assumptions of parametric tests, such as normality. This test ranks all the values from both groups and evaluates the sum of ranks for each group, allowing for valid inferences without assuming a specific distribution.
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