The table consists of 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 ŷ= 11.058 -0.01466x.
100
25-
50-
225
Residual
25
80 100 120 140 160
Speed (km/h)
Use the equation of the least-squares regression line and
the residual plot to estimate the actual fuel consumption
of the car when driving 20 kilometers per hour.
The actual fuel consumption of the car driving 20
kilometers per hour is about 11.351 +24= 13.751
liters.
The actual fuel consumption of the car driving 20
kilometers per hour is about 10.765 +2.4 = 13.165
liters.
The actual fuel consumption of the car driving 20
kilometers per hour is about 13.165 +2.4 = 15.565
liters.
The actual fuel consumption of the car driving 20
kilometers per hour is about 11.351-2.4=8.951
liters.
The actual fuel consumption of the car driving 20
kilometers per hour is about 10.765-2.4 = 8.365
liters.