Question: ( 2 0 pts ) Compute the mean absolute deviation ( MAD ) . Intermediate steps shown in colume D . ( 5 pts )

(20 pts) Compute the mean absolute deviation (MAD). Intermediate steps shown in colume D.
(5 pts) Compared to the exponential smmothing method, do you think a forecasting method that corrects for trend and seasonality can provide better forecast? Why?
Hint. Please check whether the demand history shows trend or seasonality.
 (20 pts) Compute the mean absolute deviation (MAD). Intermediate steps shown

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