Driving speed and fuel consumption Exercise 9 (page 171) gives data on the fuel consumption y of a
car at various speeds x. Fuel consumption is measured
in liters of gasoline per 100 kilometers driven, and
speed is measured in kilometers per hour. A statistical
software package gives the least-squares regression line
ỹ = 11.058 - 0.01466x. Use the residual plot to deter-
mine if this linear model is appropriate.