# Question: Refer to Data Set 15 in Appendix B A flight

Refer to Data Set 15 in Appendix B. A flight is considered on time if it arrives no later than 15 minutes after the scheduled arrival time. The last column of Data Set 15 lists arrival delays, so on-time flights correspond to values in that column that are 15 or less. Use the data to construct a 90% confidence interval estimate of the population percentage of on-time flights. Does the confidence interval describe the percentage of on-time flights for all American Airlines flights? Why or why not?

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