Standard deviation can be assumed known with q.28 what is, Ask an Expert

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The undergraduate GPA for students admitted to the top graduate business schools was 3.37 Assume this estimate was based on a sample of 120 students admitted to the top schools. Using past years' data, the population standard deviation can be assumed known with Q=.28 What is the 95% confidence interval estimate of the mean undergraduate GPA for students admitted to the top graduate schools?

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