Question: Using the data shown below, compute the mean square error, mean absolute deviation, and mean absolute percentage error for the forecasts 1 and 2 shown.
Using the data shown below, compute the mean square error, mean absolute deviation, and mean absolute percentage error for the forecasts 1 and 2 shown. Interpret your result which forecast is better?
| Month | Sales (At) | Forecast 1 (Ft) | Forecast 2 (Ft) |
| Jan | 35 | 30 | 33 |
| Feb | 29 | 28 | 32 |
| Mar | 39 | 43 | 35 |
| Apr | 42 | 40 | 45 |
| May | 51 | 48 | 52 |
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