Take data sets A and B and delete duplicated values such that each value is unique even when pooling the two data sets. Just like with the previous problem, treat data sets A and B as hypothetical data on the weights of children whose parents smoke cigarettes, and those whose parents do not, respectively.

a. Calculate the expected value of the Wilcoxon Rank-Sum test statistic E(WX) assuming the null hypothesis of equal medians being true.
b. Conduct a Wilcoxon Rank-Sum test on the data.