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March 31, 2015

March 31, 2015

Posted by **Alexus** on Monday, July 16, 2012 at 9:24pm.

- math -
**PsyDAG**, Tuesday, July 17, 2012 at 5:41pmZ = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√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 for your alpha level.

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