National Scan, Inc., sells radio frequency inventory tags. Monthly sales for a seven-month period were as follows:
| Month | Sales (000)Units |
| Feb. | 15 |
| Mar. | 19 |
| Apr. | 12 |
| May. | 21 |
| Jun. | 23 |
| Jul. | 24 |
| Aug. | 27 |
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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 0.80 for August, 0.05 for July, and 0.15 for June. (Round your answer to 2 decimal places.)
(4) Exponential smoothing with a smoothing constant equal to 0.25, assuming a March forecast of 18(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.)
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