Use the Coronary Heart Disease data set and the variable Age to answer the following:

(a) Create a normal probability plot of Age for the subpopulations where heart disease is present and absent.

(b) Interpret the normal probability plots created in part (a). Do these normal plots pass the “fat pencil test”?

(c) Estimate the median age in each of these subpopulations.

(d) Does there appear to be a difference in the distribution of the variable Age for these two subpopulations? Explain.