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July 23, 2014

July 23, 2014

Posted by **shannon** on Wednesday, May 8, 2013 at 12:08pm.

- statistics -
**PsyDAG**, Wednesday, May 8, 2013 at 12:35pmZ = (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/probability related to the Z score.

- statistics -
**shannon**, Wednesday, May 8, 2013 at 1:43pmso, for the fist part it will be

(501-485)/116= .1379? what is the SE?

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