In a Study to Investigate the Effect of Diet on Reducing

Multiple Choice

In a study to investigate the effect of diet on reducing cholesterol levels,a random sample of five subjects known to have high cholesterol had their cholesterol measured at the beginning of the study and after 6 months on a special diet.The data are given in the table below. The data are to be analyzed using the Wilcoxon signed rank test.Under the null hypothesis that the responses have a continuous distribution that is not affected by the treatment,what is the expected value of the test statistic W⁺?

A) 7.5
B) 9.8
C) 15
D) 27.5