The following historical data have been collected representing sales of a product. Compare forecasts using a three-period moving average, exponential smoothing with α = 0.2, and linear regression. Using MAD and MSE, which forecasting model is best? Are your results the same using the two error measures?

Week .... Demand

1 ...... 20

2 ...... 31

3 ...... 36

4 ...... 38

5 ...... 42

6 ...... 40