11.26 The results shown below are mean productivity measurements (average number of assemblies completed per hour) for a random ...

     11.26 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? Hourly Productivity of Assemblers in Plants   Plant Finished Units Produced Per Hour A (9 workers) 3.6 5.1 2.8 4.6 4.7 4.1   3.4 2.9 4.5 B (6 workers) 2.7 3.1 5.0 1.9 2.2 3.2 C (10 workers) 6.8 2.5 5.4   6.7 4.6 3.9 5.4 4.9 7.1 8.4