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.
15.5 How do the differences depend on region?
One way to describe the interaction between region and ethnicity in Example 15.8 is to give the differences between the per capita income of individuals of white descent and individuals of Asian descent in the four regions. Plot the differences versus region, and write a short summary of what you conclude from the plot.
15.5
In the Northeast, the per capita income for white individuals is substantially higher than for Asian individuals; in the other 3 regions, the per capita income for Asian individuals is higher than for white individuals.