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Suppose A setup is producing5K products,0.K are rejected while reaming are OK, how do I measure Process capability from this data?
Cpk = Zmin / 3
Zmin = smaller of Zupper or Zlower
Zupper = [(USL – Mean) / Estimated sigma*]
Zlower = [(Mean – LSL) / Estimated sigma*]
Estimated sigma = average range / d2
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