E-tickets are currently used by the majority of air travelers. Electronic ticketing eliminates the need for travelers to think about losing their paper tickets, as it costs airlines less to manage. However, airlines have recently received passenger complaints about their e-tickets, especially when connecting flights and a change of airlines are involved. To investigate the problem, an independent agency approached a random sample of 20 airports and obtained data on the amount of e-ticket grievances each airport received in March. The following data is provided:

17 17 17 16 15 17 12 18 12 13

16 16 14 13 16 12 15 12 11 14

At the 0.02 significance level, can the agency conclude that the mean number of complaints per airport is less than 17 per month?

a. What assumption is necessary before conducting a test of hypothesis?

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b. Not available in Connect.

c. Conduct a test of hypothesis and interpret the results.

H0 : 17; H1 : < 17;

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H0 if t <

. (Round the final answer to 3 decimal places.)

The value of the test statistic is

. (Negative answer should be indicated by a minus sign. Round the final answer to 2 decimal places.)

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H0. There is

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evidence to conclude that the mean number of complaints is less than 17. .