The z-test approximation to the Wilcoxon rank sum test for two independent samples requires that both sample sizes are smaller than 10.

Name: The z-test approximation to the Wilcoxon rank sum test for two independent samples requires that both sample sizes are smaller than 10.
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The z-test approximation to the Wilcoxon rank sum test can be used when both sample sizes are larger than 10. For smaller sample sizes, the exact Wilcoxon rank sum test should be used instead.

The Z-Test Approximation to the Wilcoxon Rank Sum Test for Two