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user 234
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Talking in terms of 6 sigma, why 4 ppm would be very costlier than 1 ppm (part per milion)?
If we talk about quality and 6-sigma (which roughly means 1 ppm defects), the 1 ppm refers to test escapes, not test rejects.
Even if a part only costs \$1, if testing fails to catch a bad part and …
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