The Mann–Whitney U test is the alternative nonparametric test that may be used in which of the following circumstances?
a. When you have three or more means to compare.
b. When the standard deviations of the samples are exactly equal.
c. When the use of the independent-samples t-test is cost prohibitive.
d. When the data assumptions required of the independent-samples t-test cannot be met.
Ans: D
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