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A textbook publishing company has compiled data on total annualsales of its business texts for the preceding nine years: |
| Year | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Sales (000): | 40.20 | 44.50 | 48.00 | 52.30 | 55.80 | 57.10 | 62.40 | 69.00 | 73.70 |
| a. |
Using an appropriate model, forecast textbook sales for each ofthe next five years. (Round your intermediate calculationsto 3 decimal places and final answers to 2 decimalplaces.) |
| Year | 10 | 11 | 12 | 13 | 14 |
| Forecast | |||||
| b. |
Compute +/- 2s control limits for the control chart for forecasterrors using just data from the original nine periods.(Round your intermediate calculations to 4 decimal placesand final answer to 2 decimal places.) |
| Control limits are | 0 ± |
| c. | Suppose
OR
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