City government has collected the following data on annual sales tax collections (in millions of $), new car registrations (in 000s), old car registrations (in 000s), and did the tax rate increase from the previous year (1=yes; 0=no). Let Tax Collections be the dependent variable. Tax New Car Old Car Tax Rate Collections Registrations Registrations Increase?

Tax Collections New car registration Old car Registration Tax rate increases 1.01 11 67 0 1.42 13 71 1 1.94 16 89 1 2.05 17 81 1 1.87 15 76 0 2.18 18 80 1 2.30 21 85 1

Run multiple regression models to predict Tax Collections with combinations of 2 or 3 independent variables from the variable listing on the previous page. List below ONLY the equations of the models with combinations of 2 and 3 independent variables that have ALL the x variables as statistically significant.

Which is the best model overall? Compare your choice in part d with a choice that would be made of the model(s) you selected in part e.