Since the Wilcoxon Rank Sum Test is a form of hypothesis testing, there will be an associated null and alternative hypothesis ...

Under the null hypothesis of no difference among class levels (or samples), this test statistic has an asymptotic chi-square distribution with r-1 degrees of freedom, where r is the number of class ...

By default, both of these tests examine the hypothesis that the median of the population from which the sample is drawn is equal to a specified value, which is zero by default. The Wilcoxon signed ...