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March 3, 2015

March 3, 2015

Posted by **Kim** on Sunday, April 29, 2012 at 7:52pm.

- Probability and Statistics -
**PsyDAG**, Monday, April 30, 2012 at 12:03pmZ = (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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