Most air travelers now use e-tickets. Electronic ticketing allows passengers to not worry about a paper ticket, and it costs the airline companies less to handle than paper ticketing. However, in recent times the airlines have received complaints from passengers regarding their e-tickets, particularly when connecting flights and a change of airlines were involved. To investigate the problem, an independent watchdog agency contacted a random sample of 20 airports and collected information on the number of complaints the airport had with e-tickets for the month of March. The information is reported below.

14 14 16 12 12 14 13 16 15 14 12 15 15 14 13 13 12 13 10 13

At the .05 significance level, can the watchdog agency conclude the mean number of complaints per airport is less than 15 per month? Conduct a test of hypothesis and interpret the results.

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a.	What assumption is necessary before conducting a test of hypothesis?
	The population is very large. The mean and standard deviation are known. Normal population. Uniform population. None needed.

c-1.	What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.)

Reject H₀ : 15when the test statistic is

.

c-2.	Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)

Value of the test statistic

c-3.	What is your decision regarding theH0?
	Reject Do not reject