After trying many multiple linear regression analyses based on the model M1 in Problem 1 above, a data analyst obtained the following statistics. The regression sum of squares 55030) by excluding the two regressors x1, x2 . The regression sums of squares 55(30),SS(30, 31), by excluding the regressor x2 . The regression sums of squares 55(30),SS(130, 32), by excluding the regressor x1 . The regression sums of squares 55(30),SS(30, 61, 62); that is, include all the regressors.