Period	Month	Demand	Level	Seasonal	Forecast	Error	ABS % Error	Sq. Error
1	Jan	100
2	Feb	138
3	Mar	71
4	Apr	100
5	May	124
6	Jun	73
7	Jul	96
8	Aug	136
9	Sep	76
10	Oct	95
11	Nov	134
12	Dec	69
13	Jan	100
14	Feb	129
15	Mar	71
16	Apr	86
17	May	138
18	Jun	80
19	Jul	86
20	Aug	131
21	Sep	82
22	Oct	93
23	Nov	124
24	Dec	77

ME:
MAPE:
MSE:

For the forecasting part, please use exponential smoothing with the following initalization values: seasonal=100

alpha value of 0.1