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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?

    © BrainMass Inc. brainmass.com June 3, 2020, 4:53 pm ad1c9bdddf
    https://brainmass.com/statistics/hypothesis-testing/calculating-the-sample-size-given-a-significance-level-6685

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

    $2.19

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