Question: Thirty randomly selected students took the calculus final. If the sample mean was 78 and the standard deviation was 7.4, construct a 99% confidence interval

Thirty randomly selected students took the calculus final. If the sample mean was 78 and the standard deviation was 7.4, construct a 99% confidence interval for the mean score of all students.

A. 74.28 to 81.72

B. 74.67 to 81.33

C. 74.29 to 81.71

D. 75.70 to 80.30

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