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Thirty randomly selected students took the calculus final

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Thirty randomly selected students took the calculus final. If the sample mean was 94 and the standard deviation was 12.2, construct a 99% confidence interval for the mean score of all students.

 

A. 90.22 to 97.78

 

B. 87.86 to 100.14

 

C. 88.52 to 99.48

 

D. 87.88 to 100.12