National Scan, Inc., sells radio frequency inventory tags. Monthly sales for a seven-month period were as follows: Month Fab. Mar. Apr. May. Jun. Jul. Aug. Sales (000) Units 18 16 15 18 20 21 23 Click here for the Excel Data File 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.) (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 intermedi 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.) Y thousands