1. Comment on the model that Dr. Hanke developed to forecast ERA. Examine the residual plots shown in Figure and determine whether this model is valid.
2. Are there any nonlinear relationships between the predictor variables and earned run average? If so, develop a new model including the appropriate variable transformation.
3. Develop a model to forecast ERA using the predictor variable WHIP instead of OBA. Which model do you prefer, the one with OBA as a predictor variable or the one with WHIP as a predictor variable? Why?
It was February, and John Hanke, a retired professor of statistics, was preparing for another fantasy baseball season. In past years, his fellow players had always teased him about using his knowledge of statistics to gain an advantage. Unfortunately, it had never been true. Teaching, researching, publishing, and committee work had kept him far too busy.