Sales for the past 12 months at Dalworth Company are given here.

a. Use a three month moving average to forecast the sales for the months May through December.
b. Use a four-month moving average to forecast the sales for the months May through December.
c. Compare the performance of the two methods by using the mean absolute deviation as the performance criterion. Which method would you commend?
d. Compare the performance of the two methods by using the mean absolute percent error as the performance criterion. Which method would you recommend?
e. Compare the performance of the two methods by using the mean squared error as the performance criterion. Which method would yourecommend?

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Month Sales (S millions) Month Sales (Smillions) January 20 24 27 31 37 47 August Saptember October November December 53 62 54 36 32 29 March May June