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September 20, 2014

September 20, 2014

Posted by **Mark** on Saturday, August 17, 2013 at 4:38pm.

- Stats -
**PsyDAG**, Sunday, August 18, 2013 at 3:04pmZ = (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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