What is the most important consideration before calculating Cpk and Ppk for a dataset that is continuous?
OPTIONS
- Process needs to follow a normal fit for data
- Process needs to have two specification limits
- Process needs to have at least one specification limit
- Process needs to be stable
ANSWER
Process needs to follow a normal fit for data
EXPLANATION
While a lot of us would have thought that stability is the most important condition and thus d is correct, stability is a must for determining Cpk, but not for Ppk. For you to calculate Cpk and Ppk you assume that process is stable in short run, but not in the long run. But, normality is something that needs to be met for both. So, THE FIRST OPTON is correct.
