To simplify production scheduling, an industrial engineer is studying the possibility of assigning one time standard to a particular class of jobs, believing that differences between jobs are negligible. To see if this simplification is possible, six jobs are randomly selected. Each job is given to a different group of three operators. Each operator completes the job twice at different times during the week, and the following results are obtained. What are your conclusions about the use of a common time standard for all jobs in this class? What value would you use for the standard?

 

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Job Operator 1 Operator 2 Operator 3 1 158.3 159.4 159.2 159.6 158.9 157.8 2 154.6 154.9 157.7 156.8 154.8 156.3 162.5 162.6 161.0 158.9 160.5 159.5 4 160.0 158.7 157.5 158.9 161.1 158.5 156.3 158.1 158.3 156.9 157.7 156.9 6. 163.7 161.0 162.3 160.3 162.6 161.8