=a. After considering seasonal effects, compare both the MAD and MSE values for the last-value method, the

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=a. After considering seasonal effects, compare both the MAD and MSE values for the last-value method, the averaging method, the moving-average method

(based on the most recent three months), and the exponential smoothing method (with an initial estimate of 80 and a smoothing constant of 0.2)

when they are applied retrospectively to the past year.

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