Practice Questions: Forecasting
1.
The following table lists sales figures for the past year.
Month
Actual Data
January
350
February
385
March
420
April
465
May
510
June
560
July
615
August
675
September
740
October
815
November
900
December
995
a.
Use the following two forecasting methods, MA(4) and MA(8), to compute all
forecast values and their MADs.
b.
Which one of these two methods, MA(4) and MA(8), is better? Please explain.
2.
The following table lists sales figures for the past six months.
Month
Actual
January
230
February
210
March
322
April
247
May
221
June
197
a.
Use the exponential smoothing method with alpha = 0.4 to compute all forecast
values (including July).
b.
Calculate MAD.
3.
Question 20, part (d).
Also calculate the forecast for period 13. (Note that exponential
smoothing with trend is double exponential smoothing.)
4.
The following table lists sales figures for the past three years. You may assume a sea
sonal cycle of one year.
Quarter
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 Spring '07
 Vaitsos
 Management, Sales, following table lists, table lists sales, lists sales figures

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