All Wilcoxon signed rank tests are two-tailed tests since we are testing whether the population median is the exact center of the population distribution.

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The Wilcoxon signed rank test can be one-tailed or two-tailed depending on the hypothesis being tested. It can test if the population median is greater than, less than, or different from a specified value.

All Wilcoxon Signed Rank Tests Are Two-Tailed Tests Since We