A normal probability plot of the standardized residuals can be used to investigate whether it is plausible that the distribution of e is approximately normal.

Question

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A normal probability plot of the standardized residuals can be used to visually inspect whether the residuals follow a normal distribution. If the plot shows that the residuals roughly follow a straight line, then it suggests that the residuals are normally distributed. If the plot deviates from a straight line, then it indicates that the normality assumption may not hold.

A Normal Probability Plot of the Standardized Residuals Can Be