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 4.652. What is the appropriate value of the test statistic to examine the claim stated by Associate professor? Answer Choices: a. 12.36 b. 14.28 c. 15.48 d. 13.67 Answer A B C D
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The null hypothesis (H0) is that the variance of the exam scores is equal to the prior studies' variance, i.e., σ² = 4.652. The alternative hypothesis (H1) is that the variance of the exam scores is less than the prior studies' variance, i.e., σ² < 4.652. Show more…
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