Sales of a particular product (in the thousands of dollars) for the years 2015 through 2018 have been $48,000, $64,000, $67,000, and $83,000 respectively.     

(a) What sales would you predict for 2019, using a simple four-year moving average?   

(b) What sales would you predict for 2019, using a weighted moving average with weights of 0.50 for the immediate preceding year and 0.3, 0.15, and 0.05 for the three years before that?     

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a Simple fouryear moving average Add up the sales for the ... View the full answer