Economic and statistics

From the following analysis of variance Analysis of Variance Source DF 55 MS Regression 5 100 20 Error 20 40 2 Total 25 140 Predictor Coef Stdev t-ratio Constant 3.00 1.50 2.00 X1 4.00 3.00 1.33 X2 3.00 0.20 15.00 X3 0.20 0.05 4.00 X4 -2.50 1.00 -2.50 X5 3.00 4.00 0.75 1.) Compute the multiple standard error of estimate