Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Bob Moore (bobbybase@clara.co.uk )
Date posted: Wed Nov 15 11:48:02 US/Eastern 2000
Subject: Sample confidence
Message:
I am manufacturing 3000 components a day, that each have a life requirement of 15 years. I have a (destructive) screening test that enables me to determine whether samples I test would fail within 15 years. Unfortunately, the test cannot provide failure data indicating failures beyond this point. Therefore the true failure distribution is unknown. How do I determine the number of samples I need to test in order to provide myself with confidence that say, 95% of the day's output will last at least 15 years? Thanks

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