Income depends on education? For a study of counties in Florida, the table shows part of a printout for the regression analysis relating y = median income (thousands of dollars) to x = percent of residents with at least a high school education.

a. County A has 10% more of its residents than County B with at least a high school education. Find their difference in predicted median incomes.

b. Find the correlation. (Hint: Use the relation between the correlation and the slope of the regression line.)

Interpret the (i) sign and (ii) strength of association.

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Variable Mean Std Dev Income 24.51 4.69 Education 69.49 8.86 The regression equation is income = -4.63 +0.42 education