A survey was taken of students at a large university in the fall of 2003; among other things, students were asked to report their age and how much money they had earned the year before.
a. Use software to access the student survey data. Report the regression equation.
b. To the nearest thousand dollars, how much additional earnings does the line predict for every additional year in age?
c. Explain why the y-intercept has no practical significance in this context.