United Dairies, Inc., supplies milk to several independent grocers throughout Dade County, Florida. Managers at United Dairies want to develop a forecast of the number of half gallons of milk sold per week. Sales data for the past 12 weeks are:

a. Construct a time series plot. What type of pattern exists in the data?
b. Use exponential smoothing with a = 0.4 to develop a forecast of demand for week 13.
What is the resulting MSE?

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Week Sales 2750 3100 3250 2800 2900 3050 Sales 3300 3100 2950 3000 3200 Week 2 9 10 12