A Wilcoxon rank sum test for comparing two populations involves two independent samples of sizes 15 and 20 . The un-standardized test statistic (that is the rank sum) is W = 210 . The value of the standardized test statistic (that is, the value of z-approximation test statistic) is:
a. 14.
b. 10.5.
c. 6.
d. -1.4.
e. -8.
D
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