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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
20
18
Production manager
26
32
16
21
Foreman
29
25
Management Services
19
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