National Scan, Inc., sells radio frequency inventory tags. Monthly sales for a seven-month period were as follows: Click here for the Excel Data File a. Forecast September sales volume using each of the following: (1) The naive approach. (2) A five-month moving average. (Round your answer to 2 decimal places.) (3) A weighted average using 0.60 for August, 0.10 for July, and 0.30 for June. (Round your answer to 2 decimal places.) (4) Exponential smoothing with a smoothing constant equal to 0.20 , assuming a March forecast of 16(000). (Round your intermediate forecast values and final answer to 2 decimal places.) (5) A linear trend equation. (Round your intermediate calculations and final answer to 2 decimal places.)