Storrs Cycles has just started selling the new Cyclone mountain bike, with monthly sales as shown in the table. First, co-owner Bob Day wants to forecast by exponential smoothing by initially setting February’s forecast equal to January’s sales with  = .1. Co-owner Sherry Snyder 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 Bob and Sherry each forecast for May and the earlier months, as relevant.

c) Assume that May’s actual sales figure turns out to be 405. Complete the table’s columns and then calculate the mean absolute deviation for both Bob’s and Sherry’s methods.

d) Based on these calculations, which method seems more accurate?

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