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Use the data from the previous X-Bar & s assignment (See below), and s-Bar/c4 formula to convert the data back to individuals and calculate 6 sigma, Cp, and Cpk. Sketch the distribution and interpret the Cp, and Cpk indices (Explain how the voice of process compares to the voice of the customer). The specification limits are .0625 +/- 0.0005 (625 +/- 5 coded). From Table B: n=5 (Observations or measures in a subgroup), c4 = .9400 X-Double-Bar = 626.6 s-Bar = 1.38 Cp= (USL – LSL)/ (6*sigma) Cpk= MIN{(USL-Process Center) or (Process Center – LSL)}/(3*sigma)
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