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If the population standard deviation is 10 , how large a sample is necessary to have a standard error that is

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The standard error given a population standard deviation of
\sigma is
\frac\sigma{\sqrt n}. So if the desired standard error is
s, then


s=\frac\sigma{\sqrt n}\implies \sqrt n=\frac\sigma s\imlies n=(\sigma^2)/(s^2)
User Mohamed Mansour
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