The Sales Records of Two Branches of a Department Store $\mu$

Essay

The sales records of two branches of a department store over the last 12 months are shown below. (Sales figures are in thousands of dollars.) We want to use the Mann-Whitney-Wilcoxon test to determine if there is a significant difference in the sales of the two branches.
a.Compute the sum of the ranks (T) for branch A.
b.Compute the mean $\mu$ _T.
c.Compute $\sigma$ _T.
d..
Use $\alpha$ = 0.05 and test to determine if there is a significant difference in the populations of the sales of the two branches.