8. Co-efficient Plot. The following plot is from a multiple regression analysis to predict vehicle miles per gallon. Variables included in the model included manual vs automatic transmission, number of cylinders, engine displacement, car weight, number of transmission gears, and horsepower. Three different models of cars were also analyzed. - Which variables had an effect on the model? - Why do you draw that conclusion? - What do the three lined up vertical dots with no horizontal lines for displacement imply