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The Cp index is a measure of potential process performance as seen in the equation below. What does a Cp value greater than 1 imply?

Cp = USL - LSL/ 6( Rbar/d2) = specification spread/process spread
  1. a process has the potential of having > 94.73% of outcomes within specifications
  2. a process has the potential of having > 97.73% of outcomes within specifications
  3. a process has the potential of having > 99.73% of outcomes within specifications
  4. a process performance cannot be calculated from given information
Explanation
Answer: C - In an assessment of potential process performance, a Cp value greater than 1 implies that a process has the potential of having > 99.73% of outcomes within specifications .

Key Takeaway: A large specification spread means that customer requirements are broad. In other words, the range between the lower specification limit and the lower specification limit is large. This means that the process performance can lead to a production of outcomes that encompass more than 99.7% of customer specifications.
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