Will your flight get you to your destination on time? The U.S. Bureau of Transportation Statistics reported the percentage of f lights that were late each month from 1995 through early 2016. Here’s a histo-gram, along with some summary statistics:

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40 30 20 10 10 15 20 25 30 % Late Arrivals 263 y 19.76 4.22 We can consider these data to be a representative sample of all months. There is no evidence of a time trend. a) Check the assumptions and conditions for inference about the mean. b) Find a 99% confidence interval for the true percentage of flights that arrive late. c) Interpret this interval for a traveler planning to fly. # of Months 40 30 20 10 10 15 20 25 30 % Late Arrivals 263 y 19.76 4.22 We can consider these data to be a representative sample of all months. There is no evidence of a time trend. a) Check the assumptions and conditions for inference about the mean. b) Find a 99% confidence interval for the true percentage of flights that arrive late. c) Interpret this interval for a traveler planning to fly. # of Months