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January 30, 2015

January 30, 2015

Posted by **tom** on Wednesday, April 27, 2011 at 12:42pm.

- statistics -
**PsyDAG**, Thursday, April 28, 2011 at 12:25pmZ = (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 scores.

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