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April 18, 2015

Posted by **Alisha** on Wednesday, July 11, 2012 at 11:40am.

- Statistics -
**PsyDAG**, Thursday, July 12, 2012 at 11:56amZ = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√n

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 proportion related to the Z score.

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