Essex Corp. of St. Louis is a small manufacturer of parts for Boeing€™s Aircraft and Missile Systems. In the late 1990s, Essex was trying to establish a SPC program. Part number 528003-N was typical. The following samples of two were observed for a critical dimension of the part (in inches). Tire lower specification, nominal, and upper specification values were .4160, .4185, .4210 inches, respectively.
a. is the process capable?
b. Construct sample mean and sample range control charts. Is the process in control?

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Sample 5 10 4190 4190 4180 4180 4175 4180 4175 4173 4183 4185 4190 4185 4180 4179 4175 4179 4175 4176 4184 4185 2 3 4 6 8