Consider the airline check-in process described in Exercise 16.76.

a. Assume the process is under control and construct a capability analysis diagram for the process. Management has specified an upper specification limit of 5 minutes.

b. Is the process capable? Justify your answer.

c. If it is appropriate to estimate and interpret C_p for this process, do so. If it is not, explain why.

d. Why didn’t management provide a lower specification limit?

Data from Exercise 16.76

Officials at Mountain Airlines are interested in monitoring the length of time customers must wait in line to check in at their airport counter in Reno, Nevada. In order to develop a control chart, five customers were sampled each day for 20 days. The data, in minutes, are presented in the table.

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CHECKIN Sample Waiting Time (mins.) 1 3.2 6.7 1.3 8.4 2.2 2 5.0 4.1 7.9 8.1 .4 3. 7.1 3.2 2.1 6.5 3.7 4 4.2 1.6 2.7 7.2 1.4 5 1.7 7.1 1.6 .9 1.8 6. 4.7 5.5 1.6 3.9 4.0 7. 6.2 2.0 1.2 1.4 8. 1.4 2.7 3.8 4.6 3.8 9 1.1 4.3 9.1 3.1 2.7 10 5.3 4.1 9.8 2.9 2.7 11 3.2 2.9 4.1 5.6 .8 12 2.4 4.3 6.7 1.9 4.8 13 8.8 5.3 6.6 1.0 4.5 14 3.7 3.6 2.0 2.7 5.9 15 1.0 1.9 6.5 3.3 4.7 16 7.0 4.0 4.9 4.4 4.7 17 5.5 7.1 2.1 .9 2.8 18 1.8 5.6 2.2 1.7 2.1 19 2.6 3.7 4.8 1.4 5.8 20 3.6 .8 5.1 4.7 6.3