standard deviation
Question
I would appreciate some clarity in how to get the correct answers especially for the Z answers.Thank
you!
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= ________