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    Sample size

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    1) Solve formula for variable:

    The formula for the margin of error to establish a confidence interval has been found mathematically to be:
    e= z s / square root of n
    Where: e = margin of error
    z = critical value
    s = sample standard deviation
    n = sample size

    Given known values for e, z, and s solve the margin of error formula n to determine sample size.

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    https://brainmass.com/math/algebra/sample-size-example-questions-32173

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    Solution Summary

    Given the formula for margin of error, derives the formula for sample size.

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