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September 22, 2014

September 22, 2014

Posted by **Erik** on Wednesday, November 7, 2012 at 3:20am.

- Statistics -
**PsyDAG**, Wednesday, November 7, 2012 at 11:30amZ = (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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