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Sample Size calculation

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  • #33524

    Ranjan
    Participant

    In the equation for sample size calculation for means,
    # = (2sigma/delta)^2, I was wondering whether the default alpha level was .05
    Also, is there a mathematical basis for calculating sample size based on the type of test you want to conduct, eg F-test, t-test, etc.
     

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    #90797

    Doc
    Participant

    The typically used alpha level is 0.05.
    Yes, there is a different sample size calculation for each type of test. I strongly recommend a book available through American Society for Quality called “How to Choose the Proper Sample Size” by Gary G. Brush. You can find it at http://www.asq.org.
    I also recommend you consider using statistical software that calculates sample sizes, such as Minitab, JMP, Statistica, StatGraphics, and others.

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