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1. Understand MA: Practice (2 yr MA) Given Error Year Actual Sales Sales Forecast (absolute value) 2015 2016 8 2017 3 -5+ 8 = 6.5
1. Understand MA: Practice (2 yr MA) Given Error Year Actual Sales Sales Forecast (absolute value) 2015 2016 8 2017 3 -5+ 8 = 6.5 13 - 6.5 = 3.5 2 2018 2 8 + 3 . 12 - 5 . 5 / = 3 . 5 2 = 5. 5 2 2019 3 + 2 2.5 1 - 2 . 5 = 1 . 5 5 2 2020 2 2 + 1 = 1.5 12 - 1.5 : 05 2 2021 3 4 + 2 = 1.5 13 - 1.5 - 1.5 2 2022 2+ 3 - 2.5 2 Cumulative Error 10.5 MAD 10. 5 - 2, 1 5 MAD = 2.1
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