You are a manager at Asda. You have been given the demand data for the past 10 weeks for swim rings for children. You decide to run three different types of forecasting methods on the data to see which gives you the best forecast.

Week Demand
12 1317
13 1307
14 1261
15 1258
16 1267
17 1256
18 1268
19 1277
20 1277
21 1297

(a) If you were to use exponential smoothing with alpha =.3, what would be your forecast for week 22? (The forecast for week 21 was 1272.)
(b) Using a 3-period weighted moving average (most recent=.6; second-most recent=.3, least recent=.1), what is the forecast for week 22?
(c) If you were to use a 3-period simple moving average, what would be your forecast for week 22?