A textbook publishing company has compiled data on total annual sales of its business texts for the preceding nine years: Year Sales (000): 1 38.20 2 43.80 3 48.60 4 51.30 5 56.30 6 59.70 7 62.40 8 69.90 9 72.90 Click here for the Excel Data File a. Using an appropriate model, forecast textbook sales for each of the next five years. (Round your intermediate calculations to 3 decimal places and final answers to 2 decimal places.) 10 11 12 13 14 Year Forecast 77.01 81.23 85.45 89.67 93.89 b. Compute +/- 2s control limits for the control chart for forecast errors using just data from the original nine periods. (Round your intermediate calculations to 4 decimal places and final answer to 2 decimal places.) Control limits are 03.71 c. Suppose actual sales for the next five years turn out as follows: Year Sales (000): 10 79.20 11 82.30 12 88.80 13 91.00 14 97.60 Is the forecast performing adequately? O No Yes