Question: Given the time series sales data for years 2018 (quarter 1 to 4), 2019 (quarters 5 to 8) as reported in the table below, forecast
Given the time series sales data for years 2018 (quarter 1 to 4), 2019 (quarters 5 to 8) as reported in the table below, forecast sales in quarters 9 to 12 of 2020. (20)
| Quarters | Sales | Trend | Seasonal Factor | Average seasonal factor | Forecasted Sales |
| 1 | 750 | 703.33 | ? | ? | |
| 2 | 680 | 737.02 | ? | ? | |
| 3 | 720 | 770.71 | ? | ? | |
| 4 | 900 | 804.4 | ? | ? | |
| 5 | 890 | 838.09 | ? | ||
| 6 | 800 | 871.78 | ? | ||
| 7 | 780 | 905.47 | ? | ||
| 8 | 1050 | 939.16 | ? | ||
| 9 | ? | ? | |||
| 10 | ? | ? | |||
| 11 | ? | ? | |||
| 12 | ? | ? |
The interpolation of historical data is
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