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October 24, 2014

October 24, 2014

Posted by **Michael** on Friday, April 22, 2011 at 10:27pm.

- statistics -
**PsyDAG**, Sunday, April 24, 2011 at 12:22pmZ = (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 that Z score.

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