The test statistic for the two- tail Wilcoxon signed- rank test is the larger of the sum of the negative signed ranks (R- )and the sum of the positive signed ranks (R+).

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The test statistic for the two-tail Wilcoxon signed-rank test is typically the smaller of the sum of the positive ranks (R+) and the sum of the negative ranks (R-), not the larger.

The Test Statistic for the Two- Tail Wilcoxon Signed- Rank