An engineer wanted to determine how the weight of a car affects gas mileages. The following data represent the weight of various cars and their gas mileage.
Car weight pound miles per gallon
A 3590 18
B 2690 26
C 3180 23
D 3565 20
E 3680 19
(a) Compute the linear correlation coefficient between the weight of a car and its miles per gallon. r = (.......) (Round to three decimal places as needed)
(b) Comment on the type of relation that appears to exist between the weight of a car and its miles per gallon based on the scatter diagram and the linear correlation coefficient.