6) When using the Wilcoxon Rank Sum test to determine if the median income for honors graduates is higher than the median income for traditional graduates. We are able to reject the null hypothesis and support the claim. Fearing criticism, the researchers are concerned that perhaps they should have chosen a more powerful test. Is this a valid concern, why or why not?
A) no, the Wilcoxon R.S. test is always powerful enough.
B) yes, because we were unable to reject the null and the t-test is a more powerful test.
C) no, the test did it's job and rejected the null; there is no need for another more powerful test.
D) yes, it is a poor test that should only be used as a last resort.