Question: If the forecast based on the data series below turned out to be 20.0 for the month of September, then which forecasting method was used?

If the forecast based on the data series below turned out to be 20.0 for the month of September, then which forecasting method was used?

January February March April May June July August
18 21 20 22 21 20 21 18

A. Moving average (n = 4)

B. Moving average (n = 3)

C. Averaging

D. Moving average (n = 2)

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