Suppose we are interested in the regression relationship between the variables of X and Y, such as

X2, 9, 10, 8, 7, 10, 4, 5, 5, 6, 7, 3 and

Y 9, 6, 8, 8, 7, 7, 12, 9, 8, 9, 10, 2

If we assume the Gauss Markov theorem holds and the regression relationship is given by y_i = b_1 + b_2 * x_i + e_i. Please calculate the sum of residual