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 researcher is interested in testing H₀ : initial and final HDL measurements have the same distribution against the one-sided alternative H_a: final HDL levels are systematically lower. The P-value for the Wilcoxon signed rank test W⁺ is:

A) 0.0281.
B) 0.0329.
C) 0.0495.
D) 0.0694.