During the past three weeks, sales of a brand of medicine have been recorded, an exponential smoothing forecast was run on the data, and the associated forecasts are as follows:
|
Week
|
Sales
|
Forecast
|
|
1
|
71
|
-
|
|
2
|
70
|
71
|
|
3
|
75
|
70.5
|
Using the data provided above in the table, calculate the forecast error for week 3.
-
4.5
-
1
-
5
- -1