Question: A normally distributed quality characteristic has specification limits at LSL = 50 and USL = 60. A random sample of size 35 results in x

A normally distributed quality characteristic has specification limits at LSL = 50 and USL = 60. A random sample of size 35 results in x  55.5 and s  0.9.
(a) Calculate a point estimate of Cpk.
(b) Find a 95% confidence interval on Cpk.
(c) Is this a 6-sigma process?

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