What is your forecast for next year's sales? (Do not round intermediate calculations and round your answer to 2 decimal places.)
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Sales over the past 10 years are shown below. Using the method of least squares, calculate the values of a and b to complete this regression equation.
| Year | Sales |
| 1 | 1,640 |
| 2 | 1,850 |
| 3 | 1,240 |
| 4 | 1,250 |
| 5 | 1,980 |
| 6 | 1,400 |
| 7 | 1,060 |
| 8 | 1,430 |
| 9 | 1,050 |
| 10 | 1,990 |
(Indicate a negative answer using a "-" sign. Do not round intermediate calculations and round your answer to 3 decimal places.)
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