The mean body mass index (BMI

The mean body mass index (BMI)
September 27, 2019
This question was created from WEEK 8 PROBLEMS completed
September 27, 2019

Question

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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