Which of the following methods is used to help assess whether the regression model meets the assumption of having normally distributed residuals?
a. Develop a normal probability plot of the residuals.
b. Develop a histogram of the residuals.
c. Develop a normal probability plot of the population means.
d. Both develop a normal probability plot of the residuals and develop a histogram of the residuals.
e. Neither develop a normal probability plot of the residuals nor develop a histogram of the residuals.
Question 2
In a multiple regression model, if the residuals have a constant variance, which of the following should be evident?
a. The residual mean should be close to zero and the residual standard deviation should be close to 1.0.
b. The plot of residuals against each independent variable should show that the spread in the residuals is about the same at all levels of the independent variables.
c. The residuals should have a variance equal to zero for all levels of the independent variable.
d. All of these.
e. None of these.
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