Vol. 3, No. 3
from Professor Cleary
"normalcy of data distribution patterns," is the correct response.
Alonga was correct in assuming that both measurements—those for tail wagging and for purring—were under control or stable. Her next step will be to examine the data to assure that it follows a normal distribution. If it does not, and she has her SQCpack handy, she can check to see if the data fits a Pearson curve, and then continue with her analysis.
(Note: "e" was not selected, since it is possible to do a capability study with one-sided specs.) To learn more about this topic, read technical support manager Matt Savage’s white paper, "Calculating cpk Indices with one spec," atwww.pqsystems.com/cpk-with-one-spec.htm.
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