[See Solution] A sample of sales data (in millions of Euros) for triple Ace auto industries was obtained and smoothed. Analysis of the data determined the
Question: A sample of sales data (in millions of Euros) for triple Ace auto industries was obtained and smoothed. Analysis of the data determined the trend was quadratic. Use this information to fit an additive model using quarter 4 as the base. Use the best model to predict for time = 9. Do not need .o perform a multiplicative model in case the additive model does not work only use the resulting quadratic model.
| TIME | SALES | QUARTER |
| 1 | 6.8 | 1 |
| 2 | 6.3 | 2 |
| 3 | 6.0 | 3 |
| 4 | 5.8 | 4 |
| 5 | 5.8 | 1 |
| 6 | 5.8 | 2 |
| 7 | 5.7 | 3 |
| 8 | 5.5 | 4 |
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