For the data set, perform exponential smoothing with alpha = 0.1 to determine the forecast for week 20.   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 13 31 14 34 15 31 16 33 17 28 18 32 19 30

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For the data set, perform exponential smoothing with alpha = 0.1 to determine the forecast for week 20.  

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
13 31
14 34
15 31
16 33
17 28
18 32
19 30
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