Question: We mentioned that if, in a Wilcoxon signed-rank test, an observation equals 0 (the value given for the mean in the null hypothesis), that observation

We mentioned that if, in a Wilcoxon signed-rank test, an observation equals μ0 (the value given for the mean in the null hypothesis), that observation should be removed and the sample size reduced by 1. Why does that need to be done?

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