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December 20, 2014

December 20, 2014

Posted by **caintgetrite** on Thursday, November 4, 2010 at 11:16pm.

- math -
**PsyDAG**, Friday, November 5, 2010 at 10:53amFirst, please do not use all capitals. Online it is like SHOUTING. Not only is it rude, but it is harder to understand. Thank you.

I assume "U" = mean and "O" = standard deviation.

Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

Since 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.

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