Q statistcs and probability

Refer to the following information: Predictor Coef SE Coef Constant -131 61 X1 78 13 X2 23.5 11 X3 -17 5.2 Source df SS MS F Regression3 845.00 Error 14 Total 17 1924.00 Assume alpha is 0.01. (a) Based on the presented information, what can you conclude about the overall validity of the model? Support your answer by the appropriate calculations. (5 marks) (b) Regardless of the results in part (a), which of the variables would you keep and which delete? Support your answer by the appropriate calculations. (13 marks)