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StatisticsQ&A LibraryThe 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= ________Question

Asked Apr 14, 2019

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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 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 = ________

Z_{1-}_{α}_{/2}= ________

Z_{1-}_{β} = ________

ES = ________

n= ________

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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