Sales of vacuum cleaners over the past 13 months were as follows:

(a) Using a moving average with three periods, predict the demand for vacuum cleaners for next February.
(b) Using a three-period weighted moving average with weights 3, 2, and 1, predict the demand for vacuum cleaners for February.
(c) Evaluate and comment on the accuracy of each of these models.

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SALES MONTH SALES MONTH January February March April Mlay Juily August September October November 12 12 15 10 12 14 13 15 June December