Posted by maddy on Saturday, October 6, 2012 at 8:39pm.
Degrees of freedom for unequal sample sizes and unequal variances =
(s1^2/n1 + s2^2/n2)^2
-----------------------------
(s1^2/n1)^2/(n1-1) + (s2^2/n2)^2/(n2-1)
Note: ^2 means squared.
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