If we want to use mileage, color, and/or condition of the vehicle on a sample of 2009 Chevy Corvette ZR1 cars to predict the price of these vehicles with multiple regression, what can we use as independent variables?
1.) the price of the cars
2.) The mileage of the cars
3.) the condition of the vehilcle
4) the color of the cars
5) all of the above
6) only 2, 4 and 3
7) only the quantitative variables can be used