Use the following information to answer Questions 8 - 11: Marketers are interested in how social media may inuence customers who purchase their products. Researchers investigated if the volume of chatter on Twitter preceding a movie's release could be used to predict the box ofce revenue (in millions of dollars) for the opening weekend. The average number of tweets per hour for a week preceding the movie release, tweet rate, was used as the explanatory variable. The regression was based on observations for 23 movies and has a residual standard error of 13.32. The sample means and standard deviations for the variables are given below: Tweet rate Revenue The table of co-efcients is given below: . Standard Estimate error Intercept 1.1501 3.6761 0.313 Tweet rate 0.0788 0.0079 9.923