The mean body mass index (BMI)

A case-control study
September 27, 2019
The mean body mass index (BMI
September 27, 2019


1.                 The mean body mass index (BMI) for boys age 12 is 23.6. An investigator wants

to test if the BMI is higher in 12-year-old boys living in New York City. How many boys are needed to ensure that a two-sided test of hypothesis has 80% power to detect a difference in BMI of 2 units? Assume that the standard deviation in BMI is 5.7.


 Alpha = ________

   Z1-α/2= ________

    Z1-β = ________

      ES = ________

         n= ________

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