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The mean age of the 43 presidents of the United

The mean age of the 43 presidents of the United States (as of 2011) on the day of inauguration is 54.6 years, with a standard deviation of 6.3 years. A researcher constructed a 95% conﬁdence interval for the mean age of presidents on inauguration day. He wrote that he was 95% conﬁdent that the mean age of the president on inauguration day is between 52.7 and 56.5 years of age. Is there anything wrong with the

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