Refer to the manufacturing process for military aircraft bolts, Exercise 13.22. Recall that the company sampled four consecutively produced bolts each hour on the hour for 25 consecutive hours and measured them using a computerized precision instrument. Use the data saved in the file to construct a control chart to monitor process variation. Is process variation "in control"? Explain.

In Exercise 13.22

A precision parts manufacturer produces bolts for use in military aircraft. Ideally, the bolts should be 37 centimeters in length. The company sampled four consecutively produced bolts each hour on the hour for 25 consecutive hours and measured them using a computerized precision instrument. The data are presented in the table below.

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Bolt Lengths (centimeters) Hour 37.03 36.96 37.16 37.20 36.81 37.08 37.04 37.11 37.06 36.97 36.90 36.85 36.99 37.02 36.91 37.01 36.99 36.98 36.90 36.87 37.07 36.88 36.98 37.01 36.98 37.10 36.89 3 4 37.13 37.07 37.01 37.17 36.91 36.88 36.96 36.94 36.91 37.03 36.99 37.00 37.12 37.01 37.11 37.03 8. 10 11 37.10 12 13 14 15 37.06 36.91 36.98 37.22 37.07 37.04 36.98 36.90 37.12 37.10 36.89 36.90 36.99 37.03 37.04 37.01 36.99 37.08 37.03 16 36.95 17 18 19 20 21 22 36.97 37.11 36.88 36.90 37.01 37.09 36.94 37.04 36.99 37.15 36.96 36.95 37.14 36.98 37.01 37.09 37.05 36.93 37.10 36.91 36.94 37.00 36.96 37.12 36.95 36.90 37.01 23 24 25 37.00 36.99 37.10 37.02 37.07 37.03 37.04 37.02 36.90