Question

Historical demand for a product is as follows:
Demand
April ............. 60
May ............. 55
June ............. 75
July ............. 60
August ............. 80
September ............. 75

a. Using a simple four- month moving average, calculate a forecast for October.
b. Using single exponential smoothing with α = 0.2 and a September forecast = 65, calculate a forecast for October.
c. Using simple linear regression, calculate the trend line for the historical data. Say the X axis is April = 1, May 5 2, and so on, while the Y axis is demand.
d. Calculate a forecast for October using your regression formula.



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  • CreatedApril 09, 2014
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