15.25 More on correlation and regression. In Exercises 15.11 and 15.13, the correlation and the slope of the least-squares line for the number of boats registered in Florida and the number of manatee deaths by boats are both positive. In Exercises 15.15 and 15.18, both the correlation and the slope for wine consumption and heart disease deaths are negative. Is it possible for these two quantities (the correlation and the slope) to have opposite signs? Explain your answer.