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February 28, 2015

February 28, 2015

Posted by **Anonymous** on Thursday, February 24, 2011 at 4:15pm.

above the population mean (in %) is a sample mean score of 12

- statistics -
**PsyDAG**, Friday, February 25, 2011 at 2:00pmZ = (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 proportion related to that Z score.

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