Question

One of Alabama Air’s top competitive priorities is on-time arrivals. Quality V.P Mike Hanna decided to personally monitor Alabama Air’s performance. Each week for the past 30 weeks, Hanna checked a random sample of 100 flight arrivals for on-time performance. The table that follows contains the number of flights that did not meet Alabama Air’s definition of on time:


(a) Using a 95% confidence level, plot the overall percentage of late flights (p) and the upper and lower control limits on a control chart.
(b) Assume that the airline industry’s upper and lower control limits for flights that are not on time are .1000 and .0400, respectively. Draw them on your control chart.
(c) Plot the percentage of late flights in each sample. Do all samples fall within Alabama Airline’s control limits? When one falls outside the control limits, what should be done?
(d) What can Mike Hanna report about the quality ofservice?


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  • CreatedJuly 23, 2013
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