Exhibit 20.4.Investment institutions usually have funds with different risk vs.reward prospectuses.A trading magazine wants to determine if the returns of high risk funds is greater than low risk funds.The magazine records the return of high and low risk funds for a sample of 22 institutions.For the Wilcoxon signed-rank test,where D = high risk return - low risk return,the value of the test statistic is 
. Refer to Exhibit 20.4 Since the sample size is at least 10,T can be assumed to follow the normal distribution with mean and standard deviation:
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