A textbook publishing company has compiled data on total annual sales of its business texts for the preceding nine years: Year Sales (000): 1 38.60 2 44.70 3 48.10 4 52.50 5 54.90 6 57.60 7 61.60 8 68.00 9 74.70 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 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 0+ c. Suppose actual sales for the next five years turn out as follows: Year Sales (000): 10 76.50 11 83.00 12 89.00 13 90.70 14 98.10 Is the forecast performing adequately? O Yes