One of Alabama Airs top competitive priorities is on-time arrivals. The airline defines on-time to mean any arrival that is within 20 minutes of the scheduled time. The airlines management has monitored the performance for the past 15 weeks. They checked a random sample of 100 flight arrivals each week for on-time performance. The table that follows contains the number of flights that did not meet Alabama Airs definition of on-time.

Week	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
Late Flights	2	6	7	4	3	2	7	8	8	6	3	4	2	2	8

Assume that there is sufficient data to perform the appropriate SPC analysis.

a) Using 95% control limits, develop the appropriate control limits for the percentage of late flights. Plot these control limits on a control chart.

b) Also, plot the percentage of late flights in each sample on the control chart.

c) Based on the results of a) and b), what would you conclude about Alabama Airs ability to meet its control limits? Explain your answer.

d) Now, the airline industrys standards for flights that are not on-time are expressed in the form of upper and lower specification limits. These upper and lower limits are 0.12 and 0.035 respectively. What would you conclude about Alabama Airs ability to meet the industry standards based on the individual weekly results? Explain your answer.