Parts coming off a machine are designed to be 2.5 inches long. Parts that are greater than 2.55 inches long are defective and parts that are shorter than 2.45 inches long are defective. You measure 20 parts off this machine and the average dimension is 2.52 inches with a standard deviation of 0.005 inches. What is the process capability index? O 0.11 0.733 O 0.33 O 2.0 O 0.6 O 1.0 4.67 0.56