12. Arandom sample of 110 lightning ashes in a certain region resulted in a sample average radar...

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12. Arandom sample of 110 lightning ashes 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. Aircraft, 1984: 607—611). Calculate a 99%

(two-sided) con dence interval for the true average echo duration m, and interpret the resulting interval.

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