a) Based on the given monthly sales data, it can be said that there is linear trend in sales over time. b) First, co-owner Bob Day wants to forecast by exponential smoothing by initially setting February's forecast equal to January's sales with =0.15. Using the forecasting method, Bob's forecast for the month of May is (round your response to two decimal places): Second, co-owner Sherry Snyder wants to forecast using a three-period moving average. The forecast for the month of May is (round your response to two decimal places). c) Assume that May's actual sales figure turns out to be 410 . For the forecast developed by Bob using exponential smoothing, the mean absolute deviation (MAD)= sales (round your response to two decimal places). For the forecast developed by Sherry using a 3-month moving average, the mean absolute deviation (MAD) = (round your response to two decimal places). d) Based on the above calculations, the forecast approach used by is better