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Process capability

A metal fabricator produces connecting rods with an outer diameter that has a 1 ± .01 inch specification. A machine operator takes several sample measurements over time and determines the sample mean outer diameter to be 1.002 inches with a standard deviation of .003 inch.
a. Calculate the process capability index for this example.
b. What does this figure tell you about the process?

Solution Preview

a. Process Capability = (USL-LSL)/6s = .02/(6*.003) = 1.11

b. Because Cpk ...

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