In Exercise 15.16 the fifth predictor has a very low correlation with the criterion (r 5 .05) and yet plays a significant role in the regression. Why? For the data in Exercise 15.16, compute . How...

In Exercise 15.16 the fifth predictor has a very low correlation with the criterion (r 5 .05) and yet plays a significant role in the regression. Why?

For the data in Exercise 15.16, compute . How well does this equation fit compared with the optimal equation? Why should this be the case?