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February 28, 2015

February 28, 2015

Posted by **Dick** on Tuesday, May 24, 2011 at 8:34am.

- Statistics -
**PsyDAG**, Tuesday, May 24, 2011 at 10:53amZ = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)(You can use n for simplicity.)

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 that Z score.

- Statistics -
**bill**, Friday, May 25, 2012 at 5:26am0.246?

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