In question 7, you used exponential smoothing to forecast week 20.  For the same data set with the same value of alpha, perform error analysis.  What is the value of the MAD (mean absolute deviation) rounded to two decimal places? alpha = 0.1 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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