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

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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 he required sample size. 

Oct 18th, 2017

n = ( z* x sigma /error)^2

   =. ( 2.578 x 14/ 4) ^2

  = 81.4

Select n = 82

Answer :  82

Apr 21st, 2015

thanks

Apr 21st, 2015

thanks everyone you all was so helpful and have a good night

Apr 21st, 2015

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