Two different forecasting techniques (F1 and F2) were used to forecast demand for cases of bottled water. Actual demand and the two sets of forecasts are as follows













Period Demand F1 F2

1 68 66 66

2 75 68 68

3 70 72 70

4 74 71 72

5 69 72 74

6 72 70 76

7 80 71 78

8 78 74 80


A.Based on given information, if we use 4-period moving average to predict the demand of period 9, what will the forecast be? (Keep 2 digits after the decimal point.)


B.Based on given information, if we use 4-period weighted moving average, the 4 weights are (0.4, 0.3, 0.2, 0.1), to predict the demand of period 9, what will the forecast be? (Keep 2 digits after the decimal point.)

C.Based on given information, if we use exponential smoothing forecast with a = 0.2 to predict the demand of period 9, what will the forecast be? (Using 68 as forecast demand for period 2, keep 2 digits after the decimal point.)

D.What is the MAD for forecast technique 1?