Data, Inference, and Decisions
The Wilcoxon Signed-Rank Test is a nonparametric statistical method used to determine whether there is a significant difference between paired observations. This test is particularly useful when the data does not meet the assumptions required for parametric tests, like the t-test, making it a reliable alternative in cases where normality cannot be assumed. It ranks the absolute differences between paired observations and assesses whether the sum of ranks for the positive and negative differences differs significantly.
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