Would it make sense to do thesame calculations as in the previous two exercises for homes that have 700 ft2? Explainwhy or why not. . Once we have chosen a model, we must examine the

residuals for violations of the conditions of the multiple regression model. Examine

the residuals from the model in Example 11.26.

(a) Plot the residuals against SqFt. Do the residuals show a random scatter, or is there

some systematic pattern?

(b) The residual plot shows three somewhat low residuals, between −$20,000 and −$40,000. Which homes are these? Is there anything unusual about these homes?

(c) Make a Normal quantile plot of the residuals. (Make a histogram if your software does not make Normal quantile plots.) Is the distribution roughly Normal?


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