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February 1, 2015

February 1, 2015

Posted by **Jessica** on Wednesday, June 22, 2011 at 8:11pm.

- statistics -
**PsyDAG**, Thursday, June 23, 2011 at 10:55amZ = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)(but you can use 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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