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Confidence Interval for Mean GPA

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The undergraduate grade point average (GPA) for students admitted to the top graduate business schools was 3.37 (Best Graduate Schools, U.S. News and World Report, 2001).

Assume this estimate was based on a sample of 120 students admitted to the top schools. Using past years Õdata, the population standard deviation can be assumed known with .28. What is the 95% confidence interval estimate of the mean undergraduate GPA for students admitted to the top graduate business schools?

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The solution gives step by step procedure for construction of confidence interval for average GPA in an attached Word and Excel file.

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