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March 1, 2015

March 1, 2015

Posted by **Erinn** on Tuesday, April 26, 2011 at 3:37pm.

- Statistics -
**PsyDAG**, Wednesday, April 27, 2011 at 1:49pmZ = (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 proportion related to the Z score.

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