# 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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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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Step 1

The provided information are:

Step 2

The required z-values can be calculated as follows:

Step 3

The value of effect size (ES)...

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