Wk Qu. 10-15 Sales over the past 10 years are shown below... 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. What is your forecast for next year's sales? T Year 1 2 3 4 5 6 7 8 Sales 1,640 1,040 1,640 1,720 1,330 1,170 1,550 1,680 ,960 1,190 9 1 10 (Do not round intermediate calculations and round your answer to 3 decimal places.) + 11.636 x (Do not round intermediate calculations and round your answer to 2 decimal places.) Sales