You Have Treadmill Endurance Test Scores for 14 College Students

Multiple Choice

You have treadmill endurance test scores for 14 college students taken just before final exam period and a second set of scores for the same students obtained on the afternoon of the last day of finals.You are pretty sure that the populations these scores are sampled from are highly skewed,and so you plan to test for differences in physical endurance using a nonparametric procedure.Which one should you use?

A) A Wilcoxon T
B) Spearman
C) A Mann-Whitney U
D) A Friedman