Which of the following statements is not correct with regards to the Wilcoxon Signed-Rank Test?
a. In large-sample problems, the Wilcoxon test in usually not less efficient than the t-test and may be more efficient if the underlying distribution is not approximately normal.
b. If the underlying distribution is normal, it is often preferred to use the t test because it will have more power associated.
c. If the sample has an underlying distribution that is normal then either the signed-rank test or the t-test could be used to test hypotheses about .
d. The Wilcoxon signed-rank test is designed for data that are basically symmetric but outlier-prone.
c
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