# Question: Central Airlines would like to set up a control chart

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?

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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