In Exercise 8.35, you found a 95% confidence interval of 18.8 months to 48.0 months for the
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a. Determine the margin of error, E.
b. Explain the meaning of E in this context in terms of the accuracy of the estimate.
c. Find the sample size required to have a margin of error of 12 months and a 99% confidence level. (Recall that σ = 42 months.)
d. Find a 99% confidence interval for the mean duration of imprisonment, μ, if a sample of the size determined in part (c) has a mean of 36.2 months.
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