Question: A simulation model of a job shop was developed to investigate different scheduling rules. To validate the model, the scheduling rule currently used was incorporated into the model and the resulting output was compared against observed system behavior. By searching the previous year’s database records, it was estimated that the average number of jobs in the shop was 22.5 on a given day. Seven independent replications of the model were run, each of 30 days’ duration, with the following results for average number of jobs in the shop:

18.9 22.0 19.4 22.1 19.8 21.9 20.2

Conduct a statistical test to evaluate whether model output is consistent with system behavior. Use the level of significance of α=0.05. Is the model valid?

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