| May 2002 |
Vol. 4, No. 5 |
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Quality Quiz
from Professor Cleary
Congratulations!
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To get a negative Cpk, either Zupper or Zlower
must be negative.
Consider A.
Consider B.
In both cases, there is a negative Cpk. A negative Cpk tells you nothing about whether your process average is outside the upper spec limit or the lower spec limit.
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Copyright 2002 PQ Systems.
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