Consider the electric power consumption data in Exercise 12-6. (a) Test for significance of regression using a = 0.05. What is the P-value for this test? (b) Use the t-test to assess the contribution...

Consider the electric power consumption data in Exercise 12-6.
(a) Test for significance of regression using a = 0.05. What is the P-value for this test?
(b) Use the t-test to assess the contribution of each regressor to the model. Using a = 0.05, what conclusions can you draw?