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December 20, 2014

December 20, 2014

Posted by **Pat** on Monday, March 26, 2012 at 9:15pm.

- statistics -
**PsyDAG**, Tuesday, March 27, 2012 at 12:20pmZ = (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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