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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. 2 3 4 Year Sales 1 1,850 1,880 13 1980 1,580 15 1,000 1,740 17 1,310 18 1,800 9 1,870 10 1,150 6 000 1,800 1,870 1,150 10 (Indicate a negative answer using a sign. Do not round intermediate calculations and round your answer to 3 decimal places.) Sales= + What is your forecast for next year's sales? (Do not round intermediate calculations and round your answer to 2 decimal places.) Sales