Using Table E.6, determine the lower- and upper-tail critical values for the Wilcoxon rank sum test statistic,

Question:

Using Table E.6, determine the lower- and upper-tail critical values for the Wilcoxon rank sum test statistic, T1, in each of the following two-tail tests:
a. a = 0.10, n1 = 6, n2 = 8
b. a = 0.05, n1 = 6, n2 = 8
c. a = 0.01, n1 = 6, n2 = 8
d. Given the results in (a) through (c), what do you conclude regarding the width of the region of non-rejection as the selected level of significance, a, gets smaller?