From the depression data set described in Table 3.4 create a data set containing only the variables AGE and INCOME.

a) Find the regression of income on age.

b) Successively add and then delete each of the following points:

AGE INCOME 42 120 80 150 180 15 and repeat the regression each time with the single extra point. How does the regression equation change? Which of the new points are outliers? Which are influential?

Use the family lung function data described in Appendix A for the next four problems.