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Calculating the sample size given a significance level

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A researcher is interested in estimating the average salary of teachers in a large urban school district. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $100?

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Lower Limit = Mean - Z*Std Dev/n^.5
<br>Upper Limit = Mean + Z*Std ...

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