Homework Answers
a)
| Week | Unit Sold (A) | 3-week moving avg. | Forecast Error (Actual Value - Forecast) | Absolute deviation (data without negative sign) |
| 1 | 523 | |||
| 2 | 587 | |||
| 3 | 622 | |||
| 4 | 601 | 577.33 | 23.67 | 23.67 |
| 5 | 615 | 603.33 | 11.67 | 11.67 |
| 6 | 578 | 612.67 | -34.67 | 34.67 |
| 7 | 598.00 | |||
| Mean Absolute Deviation (MAD)= Avg. of absolute value of forecast error | 23.33 |
b)
| Week | Unit Sold (A) | 2-week weighted moving avg. | Forecast Error (Actual Value - Forecast) | Absolute deviation (data without negative sign) |
| 1 | 523 | |||
| 2 | 587 | |||
| 3 | 622 | 561.40 | 60.60 | 60.60 |
| 4 | 601 | 608.00 | -7.00 | 7.00 |
| 5 | 615 | 609.40 | 5.60 | 5.60 |
| 6 | 578 | 609.40 | -31.40 | 31.40 |
| 7 | 592.80 | |||
| Mean Absolute Deviation (MAD)= Avg. of absolute value of forecast error | 26.15 |
c) Forecast for week 7 is 598 units sold because MAD is lower for 3-week moving average so that forecast is better.
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