arithmetic average. e weighted moving average where a=2. e weights are 8 and 2. tich one of the two is preferable based on the MAD method. iven the following demand. What is the forecast for period 6 and 18 Period demand base trend forecast (a=.70 and B = .60) 70 80 70 80 10 OU N 1 2 3 4 5 6 90 110 Given the following demand for a seasonal product. Frorecast the demand for periods 9, 10, 11, a Period Demand Index 1 2 3 15 39 70 1.25 0.70 42 arithmetic average. e weighted moving average where a=2. e weights are 8 and 2. tich one of the two is preferable based on the MAD method. iven the following demand. What is the forecast for period 6 and 18 Period demand base trend forecast (a=.70 and B = .60) 70 80 70 80 10 OU N 1 2 3 4 5 6 90 110 Given the following demand for a seasonal product. Frorecast the demand for periods 9, 10, 11, a Period Demand Index 1 2 3 15 39 70 1.25 0.70 42