You have pilot data on a study in which you measured the height and weight of 20

Question

You have pilot data on a study in which you measured the height and weight of 20 children between the ages of 10 and 12 years with asthma, and then conducted lung function tests to measure FEV (forced expiratory volume: the max amount of air that can be exhaled in 1 sec). What test(s) would you conduct if you want to determine whether BMI is associated with FEV? What if you decided to categorize BMI as “normal”, “overweight” or “obese”? What if you specifically wanted to estimate the amount of FEV per kg/m2 of BMI?

Explanation / Answer

To determine whether bmi is associated with fev , we shall conduct test for correlation coefficient, that is we first find out correlation coefficient and then perform z test to test the significance of correlation coefficient.

To estimate amount of fev per kg/m2 of bmi , we first estimate the equation of regression line between bmi and fev

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