Practice Quiz

Six Sigma Green Belt

Category - Black Belt

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RBC Inc. produces rods for construction clients. A client requests metal rods that are 20 inches ± 0.02 inches. The manufacturing process has a sigma of 0.004. What is the process capability (Cp) of this process?
  1. 2.33
  2. 1.33
  3. 1.67
  4. 2.67
Explanation
Answer: C - The process capability (Cp) is 1.67.

Key Takeaway: A process capability value greater than one implies that the process of three-sigma limit is contained within the client specification. To calculate the Cp, the following equation is used:
Cp = (USL - LSL)/ 6σ
Cp = (0.02 + 0.02)/ 6(0.004)
Cp = 1.67
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