Question
An electric car manufacturer underestimated the January sales of car by 20 units, while the actual sales was 120 units. If the manufacturer uses exponential smoothing method with a smoothing constant of α = 0.2, then the sales forecast for the month of February of the same year is ___________units (in integer).
Answer :
Correct answer is : 104
α = 0.2 , Dt-1 = 120 units , errore = 20 units
e = Dt-1 - Ft-1 = 20 ⇒ Ft-1 = 100
Ft = α Dt-1 + (1- α) Ft-1
Ft = 0.2 × 120 + (1- 0.2) 100
Ft = 24 + 80 = 104 units
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