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March 6, 2015

March 6, 2015

Posted by **Alison** on Saturday, December 22, 2012 at 2:38pm.

- Math -
**PsyDAG**, Sunday, December 23, 2012 at 2:31pmAre you talking about a Z score for the difference between means?

Z = (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/probability related to the Z score.

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