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Brothers Willie and Billie each own a gas station for the same national chain. As brothers, they are very competitive. They held a contest to

Brothers Willie and Billie each own a gas station for the same national chain. As brothers, they are very competitive. They held a contest to see who could do a better job forecasting sales for their station over the course of a year. Willie used a four-week moving average; Billie used a two-week moving average.

Willie's Petrol Park
Week Sales (1000s of gallons)
1 17
2 21
3 19
4 23
5 18
6 16
7 20
8 18
9 22
10 20
11 15
12 22

Billie's Gasoline Grotto
Week
Sales (1000s of gallons)
1 85
2 84
3 76
4 69
5 54
6 80
7 100
8 54
9 88
10 80
11 60
12 66

a. Create the forecasts for each gas station.

b. Which error calculation would be the best to use in this contest? Why?

c. Who won the contest?

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