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March 1, 2015

Posted by **Stephanie** on Wednesday, June 15, 2011 at 9:29pm.

- Statistics -
**PsyDAG**, Thursday, June 16, 2011 at 11:17amZ = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores.

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