Data on National Hockey League team performance was presented in Exercise 12-18.

(a) Test the model from this exercise for significance of regression using   0.05. What conclusions can you draw?

(b) Use the t-test to evaluate the contribution of each regressor to the model. Does it seem that all regressors are necessary? Use   0.05.

(c) Fit a regression model relating the number of games won to the number of goals for and the number of power play goals for. Does this seem to be a logical choice of regressors, considering your answer to part (b)? Test this new model for significance of regression and evaluate the contribution of each regressor to the model using the t-test. Use   0.05.