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February 1, 2015

February 1, 2015

Posted by **carole** on Friday, July 5, 2013 at 3:31am.

- stats -
**PsyDAG**, Friday, July 5, 2013 at 11:59amIf you are testing for significant differences:

Z = (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/probability related to the Z score.

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