What are the factors that determine the acceleration time (in sec.) from 0 to 60 miles per hour of a car? Data on the following variables for 30 different vehicle models were collected: Y (Accel Time): Acceleration time in sec. X₁(Engine Size): c.c. X₂ (Sedan): 1 if the vehicle model is a sedan and 0 otherwise The regression results using acceleration time as the dependent variable and the remaining variables as the independent variables are presented below.

Residuals versus Predicted Y Residuals 2 4 6 8 -2 -4 Predicted Y Residual Plot for Engine Size Residuals 2000 4000 6000 8000 Engine Residual Plot for Sedan w O Residuals -A 0.2 0.4 0.6 0.8 1.2 Sedan Normal Probability Plot JOHNW Residual -1 -2 4 N -3 -2 -1 Z Value