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A. Studying scatter diagrams. B. Improving the overall system of production. C. Prohibiting any overtime work. D. Increasing the number of quality inspectors. E. Identifying patterns of variance.
A simple and practical answer to your question will be to increase the sample size..
Otherwise in statistical terms, the common variance number (crn) has to be identified through hit and error from the given portfolio, which will be further time consuming. Or a median of more frequent occurences to be identified from a given sample..
B. Improving the overall system of production.
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