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QUESTION
An investigator wants to design a study to estimate the difference in the mean BMI between boys and girls age 12 living in New York City.
An investigator wants to design a study to estimate the difference in the mean BMI between boys and girls age 12 living in New York City. How many boya and girls are needed to ensure that a 95% confidence interval estimate for the differncein mean BMI between boys and girls has a margin of error not exceeding 2 units?
