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  • Question

    What is a good sample size of a population of 2592 and using a confidence level of 95% with a confidence interval of 10 to represent a good number of the overall populatiuon? Also, with the sample size given what would be an acceptable ROI percentage? if need a further information please email me. Thanks.


    Answer

    Lots of sites will show you the math or give you tables, but that is hard. My initial answer is a sample size of 93.  I got that answer using the second link below.

    Go to the following sites for a
    calculating tool:
     
    http://www.calculator.net/sample-size-calculator.html?type=1&cl=95&ci=10&ps=2592&x=80&y=13
    or  http://www.surveysystem.com/sscalc.htm 
     
    Your question about ROI is tougher to answer because it depends on what your organization needs in terms of ROI to justify decisions. In industry I've seen numbers as high as 45% for high risk projects. Government organizations tend to use lower numbers.


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