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 file miami contains the ratings obtained from the sample of 50 business travelers.
(Note: In your answer document, include the output obtained using Excel’s Descriptive Statistics tool)
a) Provide a point estimate of the population mean number of ratings.
b) At 95%confidence, what is the margin of error?
c) What is the 95% confidence interval estimate of the mean?
Rating
6
4
6
8
7
7
6
3
3
8
10
4
8
7
8
7
5
9
5
8
4
3
8
5
5
4
4
4
8
4
5
6
2
5
9
9
8
4
8
9
9
5
9
7
8
3
10
8
9
6