There have been 16 US Supreme Court Chief Justices who have had the following tenures (in years): 18 17 15 7 4 11 8 10 21 14 8 28 34 4 0 5 There have been 93 US Supreme Court Associate Justices who have had a mean tenure of 16.1720 years with a standard deviation of 9.871593 years. Use the critical value method and a 5% significance level to test the claim that the tenures of US Supreme Court Chief Justices have the same variation as the tenures of US Supreme Court Associate Justices. What population parameter is being tested