The table shows the quarterly demands of year 2013 and year

The table shows the quarterly demands of year 2013 and year 2014
1 2 3 4 5 6 7 8

70 ,150,140,80,75,151,145,90

alfa=0.1
beta=0.2
gama=0.4

Forecast period 5,6,7,8 using Winter\'s method ?

The table shows the quarterly demands of year 2013 and year 2014 . a) (20 pts )Forecast period 5,6,7,8 using Winter?s method according with alpha = 0. 1 , beta = 0,2 gamma =0.4 b) (20 pts) Compute the error accuracy by using MAPE. (Hint: Consider the data interval from period 5 to period 8 for calculation.)

Solution