Recall Example 7.2.3, where Nakamura et al. (A-1) studied subjects with acute medial collateral ligament injury (MCL) with anterior cruciate ligament tear (ACL). The ages of the 17 subjects were: 31; 26; 21; 15; 26; 16; 19; 21; 28; 27; 22; 20; 25; 31; 20; 25; 15 Use these data to determine if there is sufficient evidence for us to conclude that in a population of similar subjects, the variance of the ages of the subjects is not 20 years. Let a ¼ :01.