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_Y1.2^2 and r_Y2.2^2 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 residual plot of the residuals versus predicted Y? Click the icon to view the regression summary output. Click the icon to view the residual and normality plots. Equal variance Independence of errors Normality of errors None

Explanation / Answer

As we can see on the residual plot, the errors vary more wildly on the left side that the right side of the plot.

Hence, the may not have equal variances, so

OPTION A: EQUAL VARIANCE [ANSWER]

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