United Dairies, Inc., supplies milk to several independent grocers throughout Dade County, Florida. Management wants to develop a forecast of the number of half-gallons of milk sold per week. Sales data (in units) for the past 12 weeks are as follows:

Use exponential smoothing, with α = 0.4, to develop a forecast of demand for week13.

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Week Sales 2750 3100 3250 2800 2900 Week Sales 3300 3100 2950 3000 3200 3150 10 12