For the last ten month the average revenue gained per customer is listed Compute the exponentially smoothed

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Question:

For the last ten month the average revenue gained per customer is listed Compute the exponentially smoothed forecast with a 04 , and the adjusted exponentially smoothed forecast with a a 04 and b 03 and a linear trend line forecast Computer the three forecasts using cumulative error and MAD, and indicate which forecast appears to be the most accurate