\fRound your answers to 2 decimal places (e.g. 98.76). (a) Fit a multiple linear regression model that uses all regressors to these data. Test for significance of regression using a = 0.05. + )x1+ ( ) x2+ ( ) x3 + ( )xAt ( i )X5 The regression model V significant at a = 0.05. (b) Test the contribution of each variable to the model using the t-test with a = 0.05. What are your conclusions? B1 significant, B2 V significant, B3 V significant, B4 V significant, and B5 significant at a = 0.05. (c) Delete x5 from the model. Test the new model for significance of regression at a = 0.05. Also test the relative contribution of each regressor to the new model with the t-test. Using a = 0.05, what are your conclusions? + i )x 1 + ( i ) x2+ ( ) x3 + ( )X4 The regression model V significant at a = 0.05. B1 V significant, B2 V significant, B3 V significant, and B4 V significant at a = 0.05