Question: Much has been said about airline deregulation and the effects it has had on the airline industry and its performance. Following a deluge of complaints from passengers, the public relations officer of one of the major airlines asked the company's operations manager to look into the problem. The operations manager obtained average takeoff delay figures for a random sample of the company's routes over time periods of equal length before and after the deregulation. The data, in minutes of average delay per route, are as follows.
Before: 3, 2, 4, 5, 1, 0, 1, 5, 6, 3, 10, 4, 11, 7
After: 6, 8, 2, 9, 8, 2, 6, 12, 5, 9, 8, 12, 11, 10
Is there evidence in these data that the airline's delays have increased after deregulation?