The number of cans of soft drinks sold in a machine each week is recorded below. Develop forecasts using a three period moving average Find the forecast error at period 4 (hint, find the Moving Average (3) forecast number first, then substract it from the actual number of period 4 338, 219, 278, 265, 314, 323, 299, 259, 287, 302 -10.33 11:33 -12.33 1333