What can be concluded when Cp equals Cpk? A The process capability is greater than 1.33 B The process is in control and capable C The process mean is centered between the upper and lower specifications D The specification limits are too narrow E There is very little process variation
Added by Kelly M.
Step 1
- Cp (Process Capability Index) measures the potential capability of a process by comparing the width of the process spread (6σ) to the width of the specification limits. - Cpk (Process Capability Index adjusted for centering) measures the actual capability of a Show more…
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Here are the statistics for a process we are interested in: Mean = 25 StDev = 3.0 LSL = 14 USL = 37 Consider the Cp or Cpk and choose the appropriate answer whether the process is capable of meeting specifications. A. No, because Cpk = min((USL - mean) / (3 * sigma), (mean - LSL) / (3 * sigma)) is not above the minimum Cpk for capability. B. No, because Cp = (USL - LSL) / (6 * sigma) is not above the minimum Cp for capability. C. We don't have enough information to answer this. D. Yes, because Cp = (USL - LSL) / (6 * sigma) is above the minimum Cp for capability. E. Yes, because Cpk = max((USL - mean) / (3 * sigma), (mean - LSL) / (3 * sigma)) is above the minimum Cpk for capability.
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