Question: A normally distributed process has specifications of LSL = 75 and USL = 85 on the output. A random sample of 25 parts indicates that

A normally distributed process has specifications of LSL = 75 and USL = 85 on the output. A random sample of 25 parts indicates that the process is cen- tered at the middle of the specification band, and the standard deviation is s = 1.5.

a) Find a point estimate of Cp.

b) Find a 95% confidence interval on Cp. Comment on the width of this interval.

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