Find the 90% and 95% confidence intervals for the population variance and standard deviation of the medicine

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Find the 90% and 95% confidence intervals for the population variance and standard deviation of the medicine weights.

a. Find the critical values XR2 and XLfor each confidence interval.

b. Use n, s, XR2 and XLto find the left and right endpoints for each confidence interval for the population variance.

c. Find the square roots of the endpoints of each confidence interval.

d. Specify the 90% and 95% confidence intervals for the population variance and standard deviation.

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