Question: Problem 7.20 Refer to the data set of Problem 1.18. Assuming each variable is normally distributed: (a) Compute a 95% confidence interval for the variance

Problem 7.20 Refer to the data set of Problem 1.18. Assuming each variable is normally distributed:

(a) Compute a 95% confidence interval for the variance of levels of lead in the blood of the exposed group.

(b) Compute a 95% confidence interval for the variance of levels of lead in the blood of the control group.

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