solution

 

. Statistical inference requires us to make some assumptions about our data.

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(a) Obtain the residuals for the multiple regression in Example 11.13. Two movies have much larger U.S. box office revenues

than predicted. Which are they and how much more revenue did they obtain compared with that predicted?

(b) Remove these two movies and redo the multiple regression. Make a table giving the regression coefficients and their standard

errors, t statistics, and P-values.

(c) Compare these results with those presented in Example 11.13. How does the removal of these outlying movies impact the estimated model?

(d) Obtain the residuals from this reduced data set and graphically examine their distribution.Dothe residuals appear approximately Normal? Explain your answer.

 

 
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