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March 5, 2015

March 5, 2015

Posted by **Donna** on Monday, January 30, 2012 at 5:39pm.

- statistics -
**PsyDAG**, Tuesday, January 31, 2012 at 11:54pmZ = (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. Essentially it becomes just SEm.

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.

Use that to make you decision.

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