Consider the patient satisfaction survey data in Exercise 6-19
(a) Estimate the mean satisfaction given that age = 24, severity = 38, Surg-Med = 0, and anxiety = 2.8.
(b) Compute a 95% CI on this mean response.
(c) Compute a 95% PI on a future observation at the same values of the regressors.
(d) What do you notice about the relative size of these two intervals? Which is wider and why?