Chapter 9 Practice Answer the following questions using the situation and scatter plot below. Your answers should be in complete sentences. Baseball coaches use a radar gun to measure the speed of a pilcher's fastball. They also record outcomes such as hits and strikeouts. The scatterplot below shows the relationship between the average speed of strikeouts a fastball and the average number of strikeouts per nine innings for each pitcher on the Bulldogs, based on the past season. 82 84 86 88 90 92 94 96 98 speed Question Answer 1. Do you think there is a pallem? Describe the association between speed and the number of sirheouts. Include strength, direction, shape, contextualization, and any possible outliers) 2. A plot of the residuals versus the fitted values for strikeouts for the average speed of the pitcher's fastball is: Based on this residuals plot, does it seem reasonable to use linear regression for this model? Explain. 3. Comment on any unusual data point or points in the data set. Explain. (State the point and explain in context. Provide a possible reason for the outlier) 4. Do you think the association would be stronger of weaker if we used data from one month of the season? (Hint: Which data set uses individual data and which using summary datar 5. Do you think a model based on these data could accurately predict the average number of strikeouts for a pitcher with an average fastball speed of 70 mph. 7 Explain, (Hint: what kind of prediction is this based on the fact none of the other pitchers are close to 70 mph?)