Homework Answers
(a)
(i)
Moving average is the average of last four months Value.
MAD = (1/N) 
(Forecast -
Actual)
Forecast for Jan 2019 is 51
MAD = 28.28125
(ii)
The forecast for the month is the average of the past four months with averages of 04,0.3,0.2 and 0.1 weights.
MAD = 23.00
Jan 2019 Forecast =66.2
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