Following are the data on age of fetuses and length of crown-rump from Exercise 14.20.

a. Determine a point estimate for the mean crown-rump length of all 19-week-old fetuses.
b. Find a 90% confidence interval for the mean crown-rump length of all 19-week-old fetuses.
c. Find the predicted crown-rump length of a 19-week-old fetus.
d. Determine a 90% prediction interval for the crown-rump length of a 19-week-old fetus.
Presuming that the assumptions for regression inferences are met, determine the required confidence and prediction intervals.

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