In Problem 13 5 on page 470 you used the percentage
In Problem 13.5 on page 470, you used the percentage of alcohol and chlorides to predict wine quality (stored in VinhoVerde).
a. Plot the residuals versus ŷi
b. Plot the residuals versus X1i.
c. Plot the residuals versus X2i.
d. In the residual plots created in (a) through (c), is there any evidence of a violation of the regression assumptions? Explain.
e. Should you compute the Durbin Watson statistic for these data? Explain.
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