City Cycles has just started selling the new Z-10 mountain bike, with monthly sales as shown in
Question:
Barbara wants to use a three-period moving average.
(a) Is there a strong linear trend in sales over time?
(b) Fill in the table with what Amit and Barbara each forecast for May and the earlier months, as relevant.
(c) Assume that Mays actual sales figure turns out to be 405. Complete the tables columns and then calculate the mean absolute deviation for both Amits and Barbaras methods.
(d) Based on these calculations, which method seems more accurate?
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