Question:

At present, most people who travel by plane buy their tickets from the Internet. In this way, passengers avoid the worry of taking care of a paper ticket, In addition to which the airlines save. However, in recent days, the airlines Received complaints related to tickets, particularly when it is required to make a link to change air lines. In order to analyze the problem, an independent research agency Took a random sample of 20 airports and collected information related to the Number of ticket complaints that occurred during March. The following is the information

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

With a significance level of 0.05, can the research agency conclude that the Average number of complaints per airport is less than 15 per month?

1. What assumption is required before carrying out a hypothesis test?
2. Illustrate the number of complaints by airport in a frequency distribution or in a histogram. Is it reasonable to conclude that the population is governed by a normal distribution?
3. Perform a hypothesis test and interpret the results

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