Question: A random sample of 110 lightning flashes in a certain region resulted in a sample average radar echo duration of .81 sec and a sample

A random sample of 110 lightning flashes in a certain region resulted in a sample average radar echo duration of .81 sec and a sample standard deviation of .34 sec

(“Lightning Strikes to an Airplane in a Thunderstorm,” J. of Aircraft, 1984: 607–611). Calculate a 99% (two-sided) confidence interval for the true average echo duration m, and interpret the resulting interval.

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