Continuation of Exercise 3.35. Consider the decision rule described in Exercise 3.35. Suppose that the process suddenly deteriorates to 4% nonconforming output. How many samples, on average, will be required to detect this?
A production process operates with 1% nonconforming output. Every hour a sample of 25 units of product is taken, and the number of nonconforming units counted. If one or more nonconforming units are found, the process is stopped and the quality control technician must search for the cause of nonconforming production. Evaluate the performance of this decision rule.
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Introduction to Statistical Quality Control
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