Use the gasoline sales time series data from Table to show the exponential smoothing forecasts using a = 0.1. Using the mean squared error criterion, would you prefer a smoothing constant of a = 0.1 or a = 0.2?
TABLE GASOLINE SALES TIMES SERIES
Week Sales (1000s of gallons)
1 ..............................17
2 ..............................21
3 ..............................19
4 ..............................23
5 ...............................18
6 ..............................16
7 ..............................20
8 ..............................18
9 ..............................22
10 ..............................20
11 ..............................15
12 ..............................22