Question: A forecasting method has produced the following over the past five months. What is the mean absolute deviation? Actual Forecast Error 10 11 -1 8

A forecasting method has produced the following over the past five months. What is the mean absolute deviation? Actual Forecast Error 10 11 -1 8 10 -2 10 6 4 6 6 9 4 5 O 1.2 O 2.4 O 6.0 O -0.2 O 12.0

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