The following table contains the demand from the last 10 months:

Month......Actual Demand

1 ............. 31

2 ............ 34

3 ............. 33

4 ............. 35

5 ............. 37

6 ............. 36

7 ............. 38

8 ............. 40

9 ............. 40

10 ............. 41

a. Calculate the single exponential smoothing forecast for these data using an α of .30 and an initial forecast (F 1) of 31.

b. Calculate the exponential smoothing with trend forecast for these data using an α of .30, a δ of .30, an initial trend forecast (T 1) of 1, and an initial exponentially smoothed forecast (F 1) of 30.

c. Calculate the mean absolute deviation (MAD) for each forecast. Which is best?