The Wilcoxon rank sum test is used to compare two populations when the samples are independent and the data are either ordinal or interval but not normally distributed.

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The Wilcoxon rank sum test, also known as the Mann-Whitney U test, is used to compare two populations when the samples are independent and the data are either ordinal or interval, but not necessarily normally distributed. The test examines whether the two groups have the same distribution or not, based on their rank sums.

The Wilcoxon Rank Sum Test Is Used to Compare Two