SOLUTION: What is the smallest sample size if we want to estimate the population mean with a 95% confidence, a standard deviation of 60 and have the precision within (plus-minus) 5?

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Question 426942: What is the smallest sample size if we want to estimate the population mean with a 95% confidence, a standard deviation of 60 and have the precision within (plus-minus) 5?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
5+%3E=+%28s%2Fsqrt%28n%29%29%2A1.96
<==> 5+%3E=+%2860%2Fsqrt%28n%29%29%2A1.96
<==> 25%2F588+%3E=+1%2Fsqrt%28n%29
<==> 588%2F25+%3C=+sqrt%28n%29
<==> 23.52+%3C=+sqrt%28n%29
<==> 553.19+%3C=+n
The smallest sample is thus 554.