Question: A forecasting method has produced the following over the past five months. What is the mean absolute deviation (MAD)? Actual Forecast 15 12 8 11

A forecasting method has produced the following

A forecasting method has produced the following over the past five months. What is the mean absolute deviation (MAD)? Actual Forecast 15 12 8 11 10 9 6 8 9 6 2.2 -0.4 O 0.4 O 9.2 O 2.4 A seasonal index for a monthly series is about to be calculated on the basis of three years' accumulation of data. The three previous July values were 140, 160, and 170. The overall average monthly demand during the three-year time period was 180. What is the approximate seasonal index for July? O 0.833 O 156.667 O 0.870 O 1.149 O 0.149

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