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For many or most users of this form, you will save the actual calculation for a statistician. Nevertheless, please try to think about a “clinically significant difference – question 1, and indicate if you will need help with the final calculation – question 2… You may want to look at one of several “power calculators” available on the web. Here is one example: http://www.dssresearch.com/toolkit/sscalc/size_p1.asp |