Most air travellers 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 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: 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? b. Not available in Connect. c. Conduct a test of hypothesis and interpret the results. Ho : U = 17: / : W