A random sample of 106 lightning flashes in a certain region resulted in a sample average radar echo duration of 0.82 sec and a sample standard deviation of 0.44 sec. Calculate a 99% (two-sided) confidence interval for the true average echo duration u. (Round your answers to two decimal places.) ) sec Interpret the resulting interval. O we are 99% confident that this interval contains the true population mean. O we are 99% confident that the true population mean lies below this interval. O We are 99% confident that this interval does not contain the true population mean. O We are 99% confident that the true population mean lies above this interval.

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