One reason for using the Wilcoxon rank sum test rather than the t test is if you cannot assume that the populations from which the samples came are normally distributed.

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The Wilcoxon rank sum test is a nonparametric test that can be used when assuming normality of the populations is not reasonable or when the sample size is small. In contrast, the t test assumes normally distributed populations and is typically used for larger sample sizes.

One Reason for Using the Wilcoxon Rank Sum Test Rather