The Information Please Almanac provides data on the ages at inauguration and of death for the presidents of the United States. We give those data on the Weiss Stats CD for those presidents who are not still living at the time of this writing.
a. Obtain and interpret the standard error of the estimate.
b. Obtain a residual plot and a normal probability plot of the residuals.
c. Decide whether you can reasonably consider Assumptions 1–3 for regression inferences met by the two variables under consideration.