As Part of a Large,ongoing Diet Study,some Subjects of the Study

Multiple Choice

As part of a large,ongoing diet study,some subjects of the study are taking part in an intensive exercise program for four weeks.Several variables are measured on these subjects,both at the beginning and at the end of the four-week period.Some of these variables are weight,cholesterol,and triglyceride level.One objective of this particular study is to assess the effect of diet and intense exercise on increasing triglyceride levels.The data for a simple random sample of nine of these subjects are given in the table below. The data are to be analyzed using the Wilcoxon signed rank test.Under the null hypothesis that triglyceride levels have the same distribution at the beginning and at the end of the study,what is the expected value of the test statistic W⁺?

A) 20.25
B) 22.5
C) 24.75
D) 37