i need help with this

3. Refer to problem (2). The software quality engineer decided to screen (select) the independent variables to determine the best set for predict- ing y. The regression sums of squares for all possible regression models were found to be as follows: Independent variables in moel SSR 2970.61 3654.83 3584.54 5123.80 809 79 3741.30 5409.89 32 (a) For the R2 criterion, indicate which set of independent variables you would recommend as to best set for predicting y (b) An observer states: There are only three variables, so why screen You might as well use all three. Discuss