The data in the file P20_07.xlsx consist of 25 subsamples of 4 observations each on the lengths of particular bolts manufactured for use in large aircraft. The target length of these bolts is 37 centimeters. Furthermore, the bolt manufacturer has established LSL = 36.95 centimeters and USL = 37.05 centimeters.

a. Estimate Cp and the probability of meeting specifications. Is this a highly capable production process?

b. Estimate Cpk. Does your estimate of Cpk differ from that of Cp computed in part a? If so, how do you explain this difference?