I found the following formula ************ Let E be the experimental condition and let C be the control condition. Let m be the means, s the standard deviations, and n be the sample size. Then t = (mE - mC) / SQRT[(s2E + s2C) / n ] for the case of equal sample sizes, n, in both groups. See Levin (1999: 25) for the formula when sample sizes differ. ************ in my case, the sample sizes is different, But I can not find the formula. Could you please tell me the formula for t-Test of Difference of Means with different sapmle sizes?
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