![]() The application for the use of the above equation is as follows: select n units, subject all of them to the same test at the same time, note the number of units that fail after the test. N = ln(1-confidence level) / ln reliability For anyone looking in, the sample size for failure free testing is easily determined from the following equation: I was curious about your use of a reliability sampling plan supporting failure free testing for evaluating measures of attributes. But, I reviewed my reliability reference materials to verify the binomial distribution is correctly used in this application as it is in attributes inspection. I spotted your posting and thought, while it’s not a Six Sigma question per se, that I might be able to help anyway. ![]() ![]() I’ve spent a few years working in the med device industry supporting among others the quality management area. ![]()
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