Late arrivals 2016. Will your f light 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 histogram, along with some summary statistics:

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 f lights that arrive late.

c) Interpret this interval for a traveler planning to f ly.

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40 30 20 10 10 # of Months 10 15 20 25 30 % Late Arrivals 263 y 19.76 S 4.22