1. Repeat Mary's regression analysis. Did Mary have a right to be disappointed? Explain.
2. Write Mary a brief report describing how she might improve her original regression model and/or suggesting another regression model she might try.
Mary Beasley had a fair amount of regression analysis in her Executive M.B.A. program and decided a regression model might represent her data well. She knew total billable visits to Medical Oncology were trending upward and perhaps had a seasonal component. Mary was familiar with using dummy variables to represent seasonality in a regression context.