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 CHECKN.xlsx. Conduct a capability analysis for the process. Management has specified a USL of 5 minutes. Is the process capable? Justify your answer. Why didn't management provide a LSL? Construct the X-bar chart for the waiting process.
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Cp = (USL -LSL)/(6*standard deviation) = (5-0)/(6*2.189756) = 0.380555
Cp is less than 1.0, so process is not capable.
Standard deviation is calculated using stdev function in excel.
Since the data is about wait time for a customer, the company would target to achieve 0.0 wait time. So, LSL is not given.
X-bar chart:
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