For ?=0.4α=0.4  calculate the exponential smoothing forecast  and error for period 3.   Period Actual Forecast 2 1000 1100 3 1200 ? Group of answer choices Forecast = 1060, Error = 140 Forecast = 1060, Error = -140 Forecast = 1040, Error = 160 Forecast = 1040, Error = -160

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