The file AirportRating contains the rating of large and medium size airports in the United States and

Question:

The file AirportRating contains the rating of large and medium size airports in the United States and Canada.

Source: Data extracted from N. Trejos, “Portland, Indianapolis Top Airport Rankings, USA Today, December 16, 2016, p. 4B.

For large and medium airports separately:

a. Construct a 95% confidence interval estimate for the population mean rating.

b. Interpret the interval constructed in (a).

c. What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?

d. Do you think that the assumption needed in order to construct the confidence interval estimate in (a) is valid? Explain.

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