12.99 Multiple choice: Income and height University of Rochester economist Steven Landsburg surveyed economic studies in England and the United States that showed a positive correlation between height and income.

The article stated that in the United States each one-inch increase in height was worth about $1,500 extra earnings a year, on the average (Toronto Globe and Mail, 4/1/2002).

The regression equation that links y = annual earnings

(in thousands of dollars) to x = height (in inches)

a. has y@intercept = $1,500.

b. has slope 1.5.

c. has slope 1/1500.

d. has slope 1,500.

e. has correlation 0.150.