ABSTRACT
Wilcoxon signed-rank statistic is useful to test the median of a continuous symmetric distribution. Let M denote the median of the population. Consider the null hypothesis H0 :M =M0, where M0 is a specified value of the median. Let X1, . . ., Xn be a sample from the population and let
Di = Xi −M0, i = 1, 2, . . ., n.
