Question

# The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports....

The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of  business travelers is selected and each traveler is asked to provide a rating for the Miami International Airport. The ratings obtained from the sample of  business travelers follow.

 1 5 6 7 8 8 8 9 9 9 9 10 3 4 5 5 7 6 8 9 10 5 4 6 5 7 3 1 9 8 8 9 9 10 7 6 4 8 10 2 5 1 8 6 9 6 8 8 10 10

Develop a  confidence interval estimate of the population mean rating for Miami. Round your answers to two decimal places.

Solution: Since the confidence level is not given, we can assume it to be 95%. The 95% confidence interval estimate for the population mean rating for Miami is given below:

Where:

is the sample mean

is the sample standard deviation

is the critical value at 0.05 significance level for

Therefore, the 95% confidence interval is:

Therefore, the 95% confidence interval estimate of the population mean rating for Miami is

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