You have been given the task of estimating the percentage of Southwest flights that arrive on time, which is no later than 15 minutes after the scheduled arrival time. How many flights must you survey in order to be 80% confident that your estimate is within three percentage points of the true population percentage?
a. Assume that nothing is known about the percentage of on-time Southwest flights.
b. Assume that for a recent year, 84% of Southwest flights were on time (based on data from the Bureau of Transportation Statistics).
c. Given that the sample size is relatively small, can you select Southwest flights between New York (LaGuardia) and San Francisco?

  • CreatedMay 03, 2015
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