Use the following demand data (at ) to produce a double exponential smoothing forecast for period 13. Use a smoothing constant, , equal to 0.30.

Use the following demand data (at ) to produce a double exponential smoothing forecast for period 13. Use a smoothing constant, α, equal to 0.30. Use 262 as the initial SES and DES forecasts.
Period at
1…………………………………262
2…………………………………237
3…………………………………228
4…………………………………265
5…………………………………261
6…………………………………239
7…………………………………264
8…………………………………271
9…………………………………268
10…………………………………278
11…………………………………318
12…………………………………282