Which residual plot would you examine to determine whether the assumption of constant error variance is satisfied for a model with two independent variables $x _ { 1 }$ and $x _ { 2 }$ ?
A) Plot the residuals against observed $y$ values.
B) Plot the residuals against predicted values, $\hat { y }$.
C) Plot the residuals against the independent variable $x _ { 1 }$.
D) Plot the residuals against the independent variable $x _ { 2 }$.

Question

Quizplus · Accepted Answer

Plotting residuals against predicted values helps to check for constant variance (homoscedasticity) as it shows if the spread of residuals is consistent across all levels of predicted values.

Which Residual Plot Would You Examine to Determine Whether the Assumption