Weight of Car: Miles per Gallon Do heavier cars really use more gasoline? Suppose a car is chosen at random. Let x be the weight of the car (in hundreds of pounds), and let y be the miles per gallon (mpg).

The following information is based on data taken from Consumer Reports (Vol. 62, No. 4).

x 27 44 32 47 23 40 34 52 y 30 19 24 13 29 17 21 14 Complete parts

(a) through (e), given Sx 5 299, Sy 5167, Sx2 511,887, Sy2 5 3773, Sxy 5 5814, and r < 20.946.

(f) Suppose a car weighs x 5 38 (hundred pounds).

What does the least-squares line forecast for y 5miles per gallon?

AppendixLO1