Question: What are the chances your flight will leave on time? The U. S. Bureau of Transportation Statistics of the Department of Transportation publishes information about

What are the chances your flight will leave on time? The U. S. Bureau of Transportation Statistics of the Department of Transportation publishes information about airline performance. Here are a histogram and summary statistics for the percentage of flights departing on time each month from 1995 through September 2011.

There is no evidence of a trend over time. (The correlation of On Time Departure% with time is r = - 0.016.)
a) Check the assumptions and conditions for inference.
b) Find a 90% confidence interval for the mean percentage of flights that depart on time. c) Interpret this interval for a traveler planning to fly.

25 10 65 70 85 90 OT Departure (%) n 201 80.752 5 4.594 3

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