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A survey of 100 randomly selected companies asked them to report the annual income of their presidents. Assuming that incomes are normally distributed with a

A survey of 100 randomly selected companies asked them to report the annual income of their presidents. Assuming that incomes are normally distributed with a standard deviation of$30,000,determine the 99% confdence estimate of the mean annual income of all company presidents.The sample mean is $685,063

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