Based on the following data, a forecaster used simple exponential smoothing and determined the following: So = 19, S1 18.6, S2 19.08, S3 = 19.064, S4 = 19.851 and %3D %3D %3D %3D S5 = 19.481. Time Demand 1 17 2 21 3 19 4 23 18 Calculate the forecast bias. Select one: a. О b. - .3848 C. +1.924 d. + .3848

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