Donna’s Garden Supply wants a 3-month moving-average forecast, including a forecast for next January, for shed sales.

APPROACH c Storage shed sales are shown in the middle column of the following table. A 3-month moving average appears on the right

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MONTH January February ACTUAL SHED SALES 10 3-MONTH MOVING AVERAGE 12 March 13 April 16 May 19 June 23 July 26 August 30 September 28 October 18 November 16 December 14 11 (10+12+13)/3 (12+13+16)/3 = 13 (13+16 +19)/3 = 16 (16+19 +23)/3 = 19 (19+23+26)/3 = 22 (23+26+ 30)/3 = 26 (26 +30 +28)/3 = 28 (30+ 28 +18)/3 = 25 (28 +18+16)/3 = 20