Sample Size Selection Using a Margin of Error Approach
Another way of dispelling the n = 30 approach is to determine what confidence is obtained if a sample size of 30 is used for pass-fail data. By quick calculation, if a target defect rate of no more than 1% is needed, but a sample size of 30 is used, the detectable difference will be 3.5% (see Figures 5 and 6). ................
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