[Step-by-Step] Develop a four-month moving average forecast for Wallace Garden Supply and compute the MAD. A three-month moving average forecast was developed
Question: Develop a four-month moving average forecast for Wallace Garden Supply and compute the MAD. A three-month moving average forecast was developed in the section on moving averages in Table 5.3.
| Month | Sales |
| January | 10 |
| February | 12 |
| March | 13 |
| April | 16 |
| May | 19 |
| June | 23 |
| July | 26 |
| August | 30 |
| September | 28 |
| October | 18 |
| November | 16 |
| December | 14 |
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