... COEFFICIENT 95% CONFIDENCE INTERVAL X3 [C] 0.0153950 0.666662a. Calculate A, B, C, D, E, Fb. Is X2 statistically significant at 5% significance level for(i) 2-sided test ? (H0: βX2 = 0 , H1 ... 0.198404. Using F-test, decide whether we should add X4 to the model (1) or not, given Fcritical = 3.896 (0.05(1,172) 3.896F =). Remember to write down the null and alternative hypothesis.Question...