The productivity of a factory has been recorded over 10 months, together with forecasts made the previous month by the production manager, the foreman and the Management Services Department. Compare the accuracy of the three sets of forecasts.
|
Month
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
Productivity
|
22
|
24
|
28
|
27
|
23
|
24
|
20
|
18
|
20
|
23
|
|
Production manager
|
23
|
26
|
32
|
28
|
20
|
26
|
24
|
16
|
21
|
23
|
|
Foreman
|
22
|
28
|
29
|
29
|
24
|
26
|
21
|
21
|
24
|
25
|
|
Management Services
|
21
|
25
|
26
|
27
|
24
|
23
|
20
|
20
|
19
|
24
|