Here are the actual tabulated demands for an item for a nine$-$month period $($January through September$).$ Your supervisor wants to test two forecasting methods to see which method was better over this period. MONTH ACTUAL January $110$ February $130$ March $150$ April $170$ May $160$ June $180$ July $140$ August $130$ September $140$ a$.$ Forecast April through September using a three$-$month moving average.