a. Forecast September sales volume using each of the following: (1) The naive approach. Naive approach thousands (2) A five-month moving average. (Round your answer to 2 decimal places.) Moving average thousands (3) A weighted average using 0.65 for August, 0.15 for July, and 0.20 for June. (Round your answer to 2 decimal places.) Weighted average thousands (4) Exponential smoothing with a smoothing constant equal to 0.15, assuming a March forecast of 16(000). (Round your Intermediate forecast values and final answer to 2 decimal places.) Forecast thousands (5) A linear trend equation. (Round your Intermediate calculations and final answer to 2 decimal places.) Yt thousands