NOW IT'S YOUR TURN
15.2 At the ballpark. Table 14.2 (page 334) gives data on the prices charged for for beer (per ounce) and for a hot dog at Major League Baseball stadiums. The correlation between the prices is r = 0.36. What proportion of the variation in hot dog prices is explained by the least-squares regression of hot dog prices on beer prices (per ounce)?
15.2 The proportion of the variation in hot dog prices explained by the least-squares regression of hot dog prices on beer prices (per ounce) is r2 = (0.36)2 = 0.1296 or 12.96%.