The lower and upper specification limits for a component are 3.98 and 4.02 inches, respectively. The process standard deviation is .004 , and the process average is 4.005 inches. Is this process capable of achieving four-sigma performance (the foursigma performance target value is 1.33 )? No, the process has too much variability No, the process is not centered properly No, the process is not under control Yes, the process is capable of achieving four-sigma performance