The Wilcoxon signed rank test should be used in place of the t-test whenever the sample size is less than 20.

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Quizplus · Accepted Answer

The Wilcoxon signed rank test and t-test are both used to compare two related samples, but the Wilcoxon signed rank test is used when the data is not normally distributed or when the sample size is small (less than 20). However, it is not a strict rule that the Wilcoxon signed rank test must be used for small sample sizes, and the decision should be based on the specific characteristics of the data being analyzed.

The Wilcoxon Signed Rank Test Should Be Used in Place