Central Airlines would like to set up a control chart to monitor its on-time arrival performance. Each day over a 10-day period, Central Airlines chose 30 flights at random and tracked the number of late arrivals in each sample.
The results are as follows:
a. Calculate p
b. Set up a p chart to track the proportion of late arrivals.
c. Airline travel is characterized by busy and slow seasons. As a result, what is "normal" during one time of the year wouldn't be "normal" at some other time.
What difficulties might arise as a result of using a single control chart to track the proportion of late arrivals? What could Central Airlines do about this?

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NO. OF LATE- DAY SAMPLE SIZE ARRIVING FLIGHTS 1 30 2 2 30 3 3 30 4 4 30 30 1 6 30 6 7 30 4 8 30 2 30 3 10 30