Most air travelers now use e-tickets

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Most air travelers now use e-tickets. Electronic ticketing allows passengers to not worry about a paper ticket, and it costs the airlines 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 the number of complaints received on e-tickets for the month of March. The information is reported below.

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A) What assumption is necessary before conducting a test of hypothesis?

B) What is the decision rule? (be sure to include negative sign if warranted, round answer to 3 decimal places)

Reject H₀: ? ? 15 and accept H₁: ? < 15 when the test statistic is

Less than or Greater than (pick one)

C) Compute the test statistic:

D) Reject or accept the null hypothesis?