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March 5, 2015

March 5, 2015

Posted by **Nancy** on Tuesday, November 23, 2010 at 2:37pm.

- statistics -
**PsyDAG**, Tuesday, November 23, 2010 at 10:03pmZ = (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 your Z score.

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