Answer:
MSE = 198.18 / 3 = 66.06
Explanation:
Time period : Time series value
1 : 9
2 : 2
3 : 9
4 : 16
5 : 11
6 : 2
7 : 7
3 weeks moving average
F4 = average of weeks 1-3 = ( 9 + 2 + 9 ) / 3 = 20 / 3 = 6.67
F4 = average of weeks 2-4 = ( 2 + 9 + 16 ) / 3 = 27 / 3 = 9
F4 = average of weeks 3-5 = ( 9 + 16 + 11 ) / 3 = 36 / 3 = 12
F4 = average of weeks 4 - 6 = ( 16 + 11 + 2 ) / 3 = 9.67
attached is the table showing the development of the 3-week moving average