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t-Test: Two-Sample Assuming Equal Variances t-Test: Two-Sample Assuming Unequal Variances $s^2 = frac{(n_1 - 1)s_1^2 + (n_2 - 1)s_2^2}{(n_1 + n_2 - 2)}$ $t = frac{|ar{x}_1 - ar{x}_2|}{ssqrt{frac{1}{n_1} + frac{1}{n_2}}}$ $t = frac{|ar{x}_1 - ar{x}_2|}{sqrt{frac{s_1^2}{n_1} + frac{s_2^2}{n_2}}}$ $v = frac{(frac{s_1^2}{n_1} + frac{s_2^2}{n_2})^2}{frac{s_1^4}{n_1^2(n_1 - 1)} + frac{s_2^4}{n_2^2(n_2 - 1)}}$

          t-Test: Two-Sample Assuming Equal Variances
t-Test: Two-Sample Assuming Unequal Variances
$s^2 = frac{(n_1 - 1)s_1^2 + (n_2 - 1)s_2^2}{(n_1 + n_2 - 2)}$
$t = frac{|ar{x}_1 - ar{x}_2|}{ssqrt{frac{1}{n_1} + frac{1}{n_2}}}$
$t = frac{|ar{x}_1 - ar{x}_2|}{sqrt{frac{s_1^2}{n_1} + frac{s_2^2}{n_2}}}$
$v = frac{(frac{s_1^2}{n_1} + frac{s_2^2}{n_2})^2}{frac{s_1^4}{n_1^2(n_1 - 1)} + frac{s_2^4}{n_2^2(n_2 - 1)}}$

$t-Test: Two-Sample Assuming Equal Variances t-Test: Two-Sample Assuming Unequal Variances s^2 = frac(n1 - 1)s1^2 + (n2 - 1)s2^2(n1 + n2 - 2) t = frac|arx1 - arx2|ssqrtfrac1n1 + frac1n2 t = frac|arx1 - arx2|sqrtfracs1^2n1 + fracs2^2n2 v = frac(fracs1^2n1 + fracs2^2n2)^2fracs1^4n1^2(n1 - 1) + fracs2^4n2^2(n2 - 1)$

Added by Dawn B.

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