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Waiting times of airline passengers. Officials at Mountain
Chapter 13, Problem 85SE(choose chapter or problem)
Problem 85SE
Waiting times of airline passengers. 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. To develop a control chart, five customers were sampled each day for 20 days. The data, in minutes, are presented in the table below.
a. Construct an R-chart from these data.
b. What does the R-chart suggest about the stability of the process? Explain.
c. Explain why the R-chart should be interpreted prior to the .
d. Construct an from these data.
e. What does the suggest about the stability of the process? Explain.
f. Should the control limits for the R-chart and be used to monitor future process output? Explain.
Questions & Answers
QUESTION:
Problem 85SE
Waiting times of airline passengers. 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. To develop a control chart, five customers were sampled each day for 20 days. The data, in minutes, are presented in the table below.
a. Construct an R-chart from these data.
b. What does the R-chart suggest about the stability of the process? Explain.
c. Explain why the R-chart should be interpreted prior to the .
d. Construct an from these data.
e. What does the suggest about the stability of the process? Explain.
f. Should the control limits for the R-chart and be used to monitor future process output? Explain.
ANSWER:Step 1 of 8
a) Construction of an R-chart for the data.
The following are the Minitab instructions to obtain the R-chart.
1. Access the Minitab worksheet ?le (CHECKIN) that contains the quality data
2. Click on the Stat button on the Minitab menu bar and then click on Control
Charts, Variables Charts for Subgroups, and click R....
3. Specify Observations for a subgroup are in one row of columns.
4. Click OK to produce the Minitab control chart.