the answer is not 41.1 OR -13.42
Since the rest of the values are already correct and calculated hence am calculating only part C, MAPE
c) The exercise is done in excel as
Week | Value | Naïve Forecasting | Error | Abs Error | MAPE |
1 | 20 | ||||
2 | 12 | 20 | -8 | 8 | 66.67 |
3 | 15 | 12 | 3 | 3 | 20.00 |
4 | 11 | 15 | -4 | 4 | 36.36 |
5 | 18 | 11 | 7 | 7 | 38.89 |
6 | 13 | 18 | -5 | 5 | 38.46 |
MAPE= | 40.08 |
MAPE= Mean Absolute percentage error, which is calculated as
Absolute percentage error for each week
Therefore MAPE= Average value of the Absolute percentage error which is calculated here as 40.08
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