The mean height of American women in their twenties is about 64.3 inches, and the standard deviation is about 2.7 inches. The mean height of men the same age is about 69.9 inches, with standard deviation about 3.1 inches.
1. If the correlation between the heights of husbands and wives is about r = 0.5, what is the slope of the regression line of the husband’s height on the wife’s height in young couples? Give your answer to three decimal places.