Using Exponential Smoothing, the Demand Forecast for Time Period 10

Multiple Choice

Using exponential smoothing, the demand forecast for time period 10 equals the demand forecast for time period 9 plus

A) α times (the demand forecast for time period 8) .
B) α times (the forecast error for time period 9) .
C) α times (the observed demand in time period 9) .
D) α times (the forecast error for time period 8) .