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March 6, 2015

March 6, 2015

Posted by **Zelinka** on Wednesday, May 4, 2011 at 12:22pm.

- statistics -
**PsyDAG**, Wednesday, May 4, 2011 at 1:18pmZ = (mean1 - mean2)/standard error (SE) of difference between means

mean1 = sample mean

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1) (You can use 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 proportions related to the Z scores you found.

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