Most air travellers now use e-tickets. Electronic ticketing allows passengers to not worry about a paper ticket,
Question:
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 than paper ticketing. However, recently 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 Watchcat 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 Watchdcat agency conclude the mean number of complaints per airport is less than 15 per month?
a. What assumption is necessary before conducting a test of hypothesis?
b. Plot the number of complaints per airport in a frequency distribution?
Is it reasonable to conclude that the population follows a normal distribution?
c. Conduct a test of hypothesis and interpret the results. (cannot using p-value approach)
Statistical Techniques in Business and Economics
ISBN: 978-0078020520
16th edition
Authors: Douglas Lind, William Marchal