The QA guys at my company (Automotive Supplier), are always running samples and doing studies to evaluate all sorts of things. They've stated a 32 piece sample is a statistically significant size and they use that size all the time. In my memory from Engineering School, the sample size had to be taken with respect to the population, and the confidence interval. Can anyone shed some light on sample sizes? Any good references for applied quality techniques in a manufacturing enivronment. I appreciate your thoughts.
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