Apply Holt-Winters Double exponential smoothing (without seasonality) to forecast the values of sales X for periods 13 and 14, using α = 0.2 and β = 0.3. Assume 12 months of sales data, as shown in the table below:
|
Month t
|
Sales Xt
|
|
1
|
152
|
|
2
|
176
|
|
3
|
160
|
|
4
|
192
|
|
5
|
220
|
|
6
|
272
|
|
7
|
256
|
|
8
|
280
|
|
9
|
300
|
|
10
|
280
|
|
11
|
312
|
|
12
|
328
|