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): | 37.80 | 43.20 | 49.00 | 50.50 | 54.50 | 58.90 | 63.20 | 68.30 | 74.40 |
a. Using an appropriate model, forecast textbook sales foreach of the next five years. (Round your intermediatecalculations to 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 forforecast
OR
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