15.26 How can you evaluate whether collinearity exists in a multiple regression model?

15.27 What is the difference between stepwise regression and best-subsets regression?

15.28 How do you choose among models according to the Cp statistic in best-subsets regression?

16.52 What is the difference between moving averages and exponential smoothing?

16.54 How does the least-squares linear trend forecasting model developed in this chapter differ from the least-squares linear regression model considered in Chapter 13?

16.58 How does forecasting for monthly or quarterly data differ from forecasting for annual data?