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(18.12) Example 16.1 assumed that the body mass index (BMI) of all American young women follows...

(18.12) Example 16.1 assumed that the body mass index (BMI) of all American young women follows a Normal distribution with standard deviation ? = 7.5.
How large a sample would be needed to estimate the mean BMI ? in this population to within ±1 with 95% confidence?
Give your answer as a whole number.

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Answer #1

We have given here,                  
                  
Population standard deviation =7.5  
Margin of error =E=1  
Level of significance =   1-0.95=0.05  
Z critical value is (by using Z table)=   1.96  
Sample size formula is                   


=216.09
      
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