The Whistle Stop Cafe?

The whistle stop cafe in Weerns, Georgia, is well known for its popular homemade ice cream made in a small plant in back of the cafe. People drive all the way from Atlanta and Macon to buy the ice cream. The two women who own the cafe want to develop a forecasting model so they can plan their ice cream production operation and determine the number of employees they need to sell ice cream in the cafe. They have accumulated the following sales records for their ice cream for the past 12 quarters.
Year Quarter Ice Cream Sales (Gallon)
2001 1 350
2 510
3 750
4 420
2002 5 370
6 480
7 860
8 500
9 450
10 550
11 820
12 570
Develop an adjusted exponential smoothing models with alpha of 40% (x=0.5) and assess its accuracy using cumulative error (E) and average error (E). Does there appear to be any bias in the forecast?

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