would recom mend using 3 variables. If we choose to do less, method 1 would support this. if we choose to do more , method 3 would support this . 4. (4 points i What are the relative advantages and disadvantages of using the multiple regression model with all significant variables vs. using multiple regression with the first three principal components for this example? Under what circumstances might you prefer to use the Principal Components instead of the original independent variables