Ten people are randomly selected in Florida and another 10 people are randomly selected in Alabama. Table 3.20 provides summary information on mean income.

The mean is higher in Alabama both in rural areas and in urban areas. Which state has the larger overall mean income?

(The reason for this apparent paradox is that mean urban incomes are larger than mean rural incomes for both states and the Florida sample has a higher proportion of urban residents.)

TABLE 3.20 State Rural Urban Florida $26,000 (n = 3) $39,000 (n = 7)

Alabama $27,000 (n = 8) $40,000 (n = 2)