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February 1, 2015

February 1, 2015

Posted by **Mark** on Saturday, March 17, 2012 at 5:33pm.

- Statistics -
**PsyDAG**, Monday, March 19, 2012 at 4:08amWe have no access to your data, but this might help.

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 related to the Z score.

It would be a two-tailed test, since you are not predicting the direction of the difference.

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