Associate professor of a particular subject claims that the grades on last semester were little bit closer together than they had been in the past . To test the claim stated by associate professor if this claim is true , he looks at a sample of 8 exams from last semester : 42,41 , 45,49 , 43 , 40,47 , 41 Prior studies states that . the variance of exam scores was 4.632 . What is the appropriate value of the test statistic to examine the claim stated by Associate professor