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January 28, 2015

January 28, 2015

Posted by **tom** on Friday, May 13, 2011 at 5:27am.

- Statistics -
**PsyDAG**, Friday, May 13, 2011 at 11:45amZ = (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.

- Statistics -
**ran**, Tuesday, June 7, 2011 at 7:26pmk>

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