Practice Quiz

Six Sigma Black Belt Exam Prep

Category - Black Belt

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Dean’s management team is conducting measurements to quantify the manufacture of brakes for a European car company. The Cp value is calculated at greater than1.33. Which of the following statements is NOT correct about the Cp?
  1. it indicates that the process is capable in the long-term
  2. it indicates that process is incapable in the short-term
  3. it indicates that the width specifications of the process are unknown
  4. it indicates that the width specification of the process are known
Explanation
Answer: A - A Cp index value does not indicate that the process is capable in the long-term.

Key Takeaway: Short-term capability indices provide a quantifiable measurement of how capable a process is in the short-term. A Cp value greater than 1.33 indicates that a process is capable in the short-term. The Cp value is simply the distance between the upper specification limit and the lower specification limit.
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