The mean body mass index bmi for boys age 12 is 23.6. an, Ask an Expert

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The mean body mass index (BMI) for boys age 12 is 23.6. an investigator wants to test if the BMI is higher in boys age 12 living in new york city. How many boys are needed to ensure that a two-sided test of hypothesis has 80% power to detect an increase in BMI of 2 units? Assume that the standard deviation in BMI is 5.7.

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