Question: Checking the model assumptions. Statistical inference requires us to make some assumptions about our data. These should always be checked prior to drawing conclusions. For

Checking the model assumptions. Statistical inference requires us to make some assumptions about our data. These should always be checked prior to drawing conclusions.

For brevity, we did not discuss this assessment for the movie revenue data of Section 11.2, so let’s do it here. MOVIES

(a) Obtain the residuals for the multiple regression in Example 11.13 (pages 552–553), and construct a histogram and Normal quantile plot. Do the residuals appear approximately Normal? Explain your answer.

(b) Plot the residuals versus the opening-weekend revenue. Comment on anything unusual in the plot.

(c) Repeat part

(b) using the explanatory variable Budget on the x axis.

(d) Repeat part

(b) using the predicted value on the x axis.

(e) Summarize your overall findings from these summaries. Are the model assumptions reasonably satisfied? Explain your answer.

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