The International Air Transport Association surveys business

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 50 business travelers is selected and each traveler is asked to provide a rating for the Miami International Airport. The results of the survey showed a sample mean of 6.34 and a samplestandard deviation of 2.16.

Develop a 95% confidence interval estimate of the population mean rating for Miami (to 3 decimals).

Solution

95% confidence interval is  (5.726, 6.954)