In conducting the Wilcoxon signed rank test, after collecting the sample data the next step is to find the sample median and subtract this value from each data value to obtain the deviations.

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In the Wilcoxon signed-rank test, the next step after collecting the sample data is to calculate the differences between the paired observations, not to find the sample median and subtract it from each data value.

In Conducting the Wilcoxon Signed Rank Test, After Collecting the Sample