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.
n = ( z* x sigma /error)^2
=. ( 2.578 x 14/ 4) ^2
Select n = 82
Answer : 82
thanks everyone you all was so helpful and have a good night
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