What does it mean if Cp = Cpk? A) The process is aimed outside of the specification limits B) The process is centered exactly in the middle of the specification C) The process is sitting on the upper specification limit D) The process is sitting on the lower specification limit E) None of the above
Added by Mary G.
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It is calculated as the ratio of the tolerance width to the process variation. Cp = (USL - LSL) / (6σ), where USL is the upper specification limit, LSL is the lower specification limit, and σ is the process standard deviation. Cpk, on the other hand, is a measure Show more…
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When the upper specification limit is 25.5 mg and the lower specification limit is 18.5 mg, the process mean is 20.35 mg, and the standard deviation is 0.491 mg, which of the following statements is true? A. The Cpk is 0.62 B. The Cpk is 1.73 C. The process is centered between the specification limits. D. The process will have capable outputs.
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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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