Chapter 16.1, Problem 9E

The film Suicide Squad has an average rating of 3.7 out of 5 based on 117,323 user ratings (Rotten Tomatoes website, September 4, 2016). How are the user ratings of Suicide Squad related to the age of the user and the rating the user gave The Secret Life of Pets? Suppose we have a sample of users’ ages and their ratings for the movies Suicide Squad and The Secret Life of Pets as included in the DATAfile RottenTomatoes.

1. a. Develop a scatter diagram for these data with the users’ ages as the independent variable and their ratings of Suicide Squad as the dependent variable. Does a simple linear regression model appear to be appropriate?
2. b. Use the data provided to develop the regression equation for estimating the user ratings of Suicide Squad that is suggested by the scatter diagram in part (a).
3. c. Include the user rating of The Secret Life of Pets as an independent variable in the regression model developed in part (b). Interpret the regression coefficient for the user rating of The Secret Life of Pets.
4. d. Is the regression equation developed in part (b) or the regression equation developed in part (c) superior? Explain.
5. e. Suppose a 31-year-old user gave The Secret Life of Pets a rating of 4. Use the model you selected in part (d) to predict that user’s ratings of Suicide Squad.