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Hypothesis Testing

Hypothesis Testing using only P value format. Do not copy and paste all the results from the hypothesis test, you are the expert, only include critical metrics from the test results.

Most air traffic passenger use e-tickets. Electronic ticketing allows passengers not worry about paper tickets and it reduces the airlines costs. However in recent times airlines have begun to receive complaints from passengers regarding e-tickets, especially when having to switch planes. To investigate this problem an independent watchdog agency contacted a random sample of the last 21 months and collected data on the number of complaints due to e-tickets.

At the .01 level of significance is there evidence to conclude that the ten year average of 15 complaints per month has now changed and actually increased due to electronic ticketing?

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