Late departure statistics of all airlines are available online to the travelling public. A major carrier is concerned about its late departures at one of its hub airports. The airline has 100 flights daily from the airport. They recorded delayed departures for 10 days and the data are given below:
5, 7, 4, 15, 12, 6, 15, 12, 5, 6

Table 1.11:

a. Prepare a p chart with a sample size consisting of 1 week’s delayed departure percentage.

b. Is the sample size sufficient to monitor delays on a daily basis?

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Data on Daily Mail Delivery (Exercise 1.9) Sample no. 3 # Satisfactory 109 1 110 2 112 4 114 5 112 6 111 7 105 8 100 9 104