The Effect of Inspector Errors on the True Fraction Nonconforming: An Industrial Experiment


Burke, Richard J.; Davis, Robert D.; Kaminsky, Frank C.; Roberts, Arthur E.P.   (1995, Marcel Dekker, Inc. and ASQC)   Productivity Sciences Inc., Greenfield, MA

Quality Engineering    Vol. 7    No. 3
QICID: 11682    March 1995    pp. 543-550
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Article Abstract

This article describes the effect of Type I and Type II inspector errors on the true fraction nonconforming. Estimates of these errors from previous studies for different types of products and production processes are summarized. A procedure is outlined for conducting experiments to obtain estimates of the Type I and Type II errors. The results of an industrial experiment to estimate these errors is presented and compared to the previous studies. As the experimental results had a high Type II error, the use of multiple 100% inspections to remove nonconforming product is discussed. The final part of the industrial experiment used multiple 100% inspections to remove the nonconforming product, and the results of this experiment are presented and compared to the mathematical model.


Inspection,Type I error,Estimation,Nonconformities,One-hundred percent (100%) inspection,Type II error

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