The table below shows a portion of the returns for Fidelity's Equity Income mutual fund and Vanguard's Equity Income mutual fund from 2000 through 2010; the full data set is on the text website, labeled Fund Comparison.
a. Specify the competing hypotheses to determine whether the median difference between the returns differs from zero.
b. Calculate the value of the Wilcoxon signed-rank test statistic T. Assume normality of T.
c. At the 5% significance level, what is the decision rule?
d. Does the median difference between the returns differ from zero? Explain.