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if 99.7 % of the targets are within 3 sigma limits, then how exactly does 6 sigma explains itself? (how does iot affect the USL & LSL)

are we extending the tolerance levels? or confining the targets to be within the 6 sigma levels?

moreover is 6 standard deviations greater or lesser than 3 standard deviations in the normal distribution? 10…[Read more]