# Question

A sample of 20 items provides a sample standard deviation of 5.

a. Compute the 90% confidence interval estimate of the population variance.

b. Compute the 95% confidence interval estimate of the population variance.

c. Compute the 95% confidence interval estimate of the population standard deviation.

a. Compute the 90% confidence interval estimate of the population variance.

b. Compute the 95% confidence interval estimate of the population variance.

c. Compute the 95% confidence interval estimate of the population standard deviation.

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