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The standard IQ test has a mean of 96 and a standard deviation of 14. We...

The standard IQ test has a mean of 96 and a standard deviation of 14. We want to be 99% certain that we are within 4 IQ points of the true mean. Determine the required sample size.
Math   Statistics-And-Probability   
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Answer #1

We have given here,              
              
Population standard deviation =14
Margin of error =E=4
Level of significance =1-0.99=0.01
Z critical value is (by using Z table)=2.58
Sample size formula is               


=81.28  

   

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