EXAMPLE 15.7 Per Capita Income
The American Community Survey provides annual per capita income for various subpopulations of the United States. Here are the per capita incomes for individuals of two ethnicities in two regions of the United States.6 (The data include people who earned nothing.)
| Region | White | Asian | Mean |
| Midwest | $28,528 | $29,166 | $28,847 |
| Northeast | $35,192 | $32,295 | $33,744 |
| Mean | $31,860 | $30,731 | $31,295 |