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Confidence Interval for GPA of Students

The GPA's for 10 randomly selected students are listed below. Construct a 90% confidence interval for the population standard deviation. Assume the data are normally distributed.
2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 .8

a. 1.10, 2.01
b. .32, .85
c. .53, 1.01
d. .81, 1.83

Solution Summary

This solution contains step-by-step calculations to determine the 90% confidence interval for the population standard deviation in an Excel file.

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