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December 18, 2014

December 18, 2014

Posted by **Probability** on Tuesday, February 15, 2011 at 8:56pm.

- statistics -
**PsyDAG**, Wednesday, February 16, 2011 at 11:41amZ = (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 proportions related to the Z scores calculated.

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