Analysis of Variance Source DF SS MS Regression 5 100 20 Residual Error 20 40 2 Total 25 140 Predictor Coefficient SE Coefficient t Constant 3.00 1.50 2.00 X1 4.00 3.00 1.33 X2 3.00 0.20 15.00 0.20 0.05 4.00 -2.50 1.00 -2.50 X5 3.00 4.00 0.75 a. What is the sample size b. Calculate the value of r-square c. Does the regression coefficient have a significant effect on the model. Use significant level = 0.05