If data is normally distributed, then the Wilcoxon signed-rank test is more powerful than the sign test.

Name: If data is normally distributed, then the Wilcoxon signed-rank test is more powerful than the sign test.
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The Wilcoxon signed-rank test takes into account the magnitude of differences, making it more powerful than the sign test, which only considers the direction of differences, when data is normally distributed.

If Data Is Normally Distributed, Then the Wilcoxon Signed-Rank Test