In a Study to Investigate the Effect of Regular Exercise

Multiple Choice

In a study to investigate the effect of regular exercise on raising HDL (good cholesterol) levels, a random sample of five male subjects known to have low HDL levels had their HDL measured. after six months on a regular exercise schedule, it was measured again. The data are given in the following table. The standardized value z of the Wilcoxon signed rank test W⁺ is:

A) 0.4.
B) 0.95.
C) 1.48.
D) 3.51.