The results shown below are mean productivity measurements (average number of assemblies completed per hour) for a random sample of workers at each of three plants. Research question: Are the mean hourly productivity levels the same for workers in these three plants? Plant A Plant B Plant C 3.6      2.7      6.8 5.1      2.1      4.5 3.8      6.0      6.4 4.6      2.9      7.7 4.7      3.2.     4.6 3.1      2.2      4.9 4.4                 4.4 3.9                 5.9 3.5                 6.1                7.4

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The results shown below are mean productivity measurements (average number of assemblies
completed per hour) for a random sample of workers at each of three
plants. Research question: Are the mean hourly productivity levels the same for workers in
these three plants?
Plant A Plant B Plant C
3.6      2.7      6.8
5.1      2.1      4.5
3.8      6.0      6.4
4.6      2.9      7.7
4.7      3.2.     4.6
3.1      2.2      4.9

4.4                 4.4

3.9                 5.9

3.5                 6.1

               7.4

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