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    Sample Size Formula

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    In Week 1 of RES/342 we determined the optimal sample size, n, using a three variable formula.

    Fill in the following table (see attachment) listing the three variables and specify the effect on n (either + or -) of increasing and decreasing each variable, one at a time.

    © BrainMass Inc. brainmass.com June 3, 2020, 10:01 pm ad1c9bdddf
    https://brainmass.com/statistics/sample-size-determination/understanding-formula-optimal-sample-size-211131

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    n = [(z*sigma)/E]^2

    z = 1.96, E = 1, sigma changes

    sigma = 1 n = 3.8416
    sigma = 2 n = 15.3664
    sigma = 3 n = 34.5744
    sigma = 4 n = ...

    Solution Summary

    The solution provides a step-by-step explanation, filling in the given table, listing the three variables and specifying the effect on n (either + or -) of increasing and decreasing each variable, one at a time.

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