Use the data in Exercise 23 of Section 1. To locate the points, use the midpoint of each income category; use a value of \($25,000\) for the category “less than \($30,000\),”and use a value of \($70,000\) for the category “more than \($60,000\).”

Exercises 13–20 refer to the tables in the Section 1 Exercises. In each case, do the following.