What are the factors that determine the acceleration time (in sec.) from 0 to 60

Question

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., X_1 (Engine Size): c.c, and X_2 (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 in the accompanying table. The coefficient of partial determination r^_Y12^2 and r_Y21^2 are 0.3301, and 0.0594, respectively. The coefficient of determination for the regression model using each of the 2 independent variables as the dependent variable and the other independent variable as independent variables (R_j^2) are, respectively 0.0077, and 0.0077. Which of the following assumptions is most likely violated based on the normal probability plot? Click the icon to view the regression summary output.

Explanation / Answer

Linearity because the residual plot shows two clusters. points are not randomly scattered.

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