Quality eLine Newsletter
June 2004
Vol. 6, No. 6

Quality Quiz
from Professor Cleary

You're right!

Click here to watch a video explaining the answer.

A closer look at the CHARTrunner histogram indicates the appropriate statistics for capability analysis:

As indicated in CHARTrunner, the Cpk of –1 is indeed correct. Visually, one can see that 99.9% of the parts are out of spec, since they are almost all smaller than the lower spec limit.

Thus, any Cpk with a negative sign indicates a high number of defects on the low side.

Copyright 2004 PQ Systems.

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