Part IV. what is the best model for predicting the # of active physicians in a county? Possible predictors include: 1. X1 = Total Population 2. X2 = Total Personal Income 3. X3 2 Land Area 4. X4 = Percent of Pop. Age 65 or older 5. X5 = Number of hospital beds 6. X6 = Total Serious Crimes T. X? = Percent of population HS Grads 8. X8 = Percent Unemployment