For Exercises 15.1 to 15.3, see pages 15-6 to 15-7; for 15.4 to 15.6, see page 15-10; for 15.7, see pages 15-12 to 15-13; for 15.8 to 15.10, see page 15-15; for 15.11, see page 15-16; for 15.12 and 15.13, see page 15-18; and for 15.14 to 15.16, see pages 15-20 to 15-21.
15.6 Lack of interaction.
Suppose that the difference between the per capita income of white and Asian individuals remained fixed at $2897 for all four regions in Example 15.8 and that the per capita income for whites in each region is as given in the table. Find the per capita income for individuals of Asian descent in each region, and make a plot of the eight group means. In what important way does your plot differ from Figure 15.2?