To compare the means of two populations which cannot be assumed to be normally distributed and only ordinal-level data is available from two independent samples, The Mann-Whitney U test should be used instead of the t-test for independent samples..

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The Mann-Whitney U test is a non-parametric test that can be used to compare the means of two populations with ordinal-level data that cannot be assumed to be normally distributed. This test is suitable for independent samples, and is an alternative to the t-test for independent samples, which assumes normal distribution of the populations.

To Compare the Means of Two Populations Which Cannot Be