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If the age of the US population has a standard deviation of 17 years, how many observations would be needed to ensure that a 99%

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If the age of the US population has a standard deviation of 17 years, how many observations would be needed to ensure that a 99\% confidence interval for the average age in the sample had a margin of error of less than 1 year? Note* Recall the margin of error is 1/2 of the total width of the confidence interval. 1110 1564 1918 782

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