The Wellington Company wants to develop a simple linear regression model for one of its products. Use the following 12 periods of historical data to develop the regression equation and use it to forecast the next three periods.
Period a t
1……………………………946
2……………………………905
3……………………………837
4……………………………779
5……………………………794
6……………………………643
7……………………………670
8……………………………608
9……………………………488
10…………………………649
11…………………………446
12…………………………437