Stata Basics Executing and interpreting bivariate hypothesis tests

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=nYLjeQyHBQ4

exact df=((variance1 / n1) + (variance2 / n2))^2 / ((1/(n1−1))(variance1/n1)^2 + (1/(n2−1))(variance2/n2)^2)

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