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