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February 1, 2015

February 1, 2015

Posted by **shasha** on Tuesday, May 25, 2010 at 8:39pm.

- stats -
**PsyDAG**, Wednesday, May 26, 2010 at 11:23amZ = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

Since 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.

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