The specifications for a plastic liner for concrete highway


The specifications for a plastic liner for concrete highway projects call for a thickness of 3.0 mm (plus or minus) 0.2 mm. The standard deviation of the process is estimated to be 0.02 mm. The process is known to operate at a mean thickness of 2.9 mm.

(a) What is the Cpk of the process? Please provide the formula, at least one step of calculation, and the correct answer for full credit.

(b) Is the process capable based on the Cpk value and why?

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