Based on the last 15 periods the underlying trend of sales is y = 345.12 - 1.35x. If the 16th period has a seasonal factor of -23.62, assuming an additive forecasting model, what is the forecast for that period, in whole units?
A、300
B、301
C、324
D、325
A、300
B、301
C、324
D、325
【参考答案及解析】
A If x = 16, y = 345.12 - (1.35 x 16) = 323.52 Forecast = trend + seasonal component = 323.52 - 23.62 = 299.9 = 300 (to nearest unit)
A If x = 16, y = 345.12 - (1.35 x 16) = 323.52 Forecast = trend + seasonal component = 323.52 - 23.62 = 299.9 = 300 (to nearest unit)