Problem: A process was set to meet the design specifications of USL = 26 and LSL = 18. The standard deviation of the process was found to be 1.2. The process mean was set to 22.5. a) Calculate the process capability index of the process? Is the process capable of meeting the specifications? b) What would you change so that the process meets the specifications? c) What would it take to meet the 4-sigma quality?