Unpaired t-test | |
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Find sample size:
If you can estimate group means and standard deviation, use this form to find the number of subjects you need. |
Find effect size:
If you know the number of subjects and the standard deviation of your measurement, use this form to see how small a difference you can detect. |

Choose another study design v. 03/03 Contact: sfh2@columbia.edu Source: G.W. Snedecor & W.G. Cochran Statistical Methods (7th ed., p. 104) |