As of September 4, 2016, the film Suicide Squad had an average rating of 3.7 out of 5 based on 117,323 viewer ratings (Rotten Tomatoes website). How are the viewer ratings of Suicide Squad related to the viewer age and the viewer ratings of The Secret Life of Pets? The file RottenTomatoes contains a sample of data containing viewer ages and their ratings of Suicide Squad and The Secret Life of Pets. 

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? 

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). 

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. 

d. Is the regression equation developed in part (b) or the regression equation developed in part (c) superior? Explain.