Studies on a machine that molds plastic water pipe indicate that when it is injecting 1-inch diameter pipe, the process standard
deviation is 0.05 inches. the one-inch pipe has a specification of 1-inch plus or minus 0.10 inch. what is the process capability index (cpk) if the long-run process mean is 1 inch? 0.50 0.67 1.00 2.00
