Thursday

April 24, 2014

April 24, 2014

Posted by **Donna** on Monday, March 25, 2013 at 2:17pm.

- statistics -
**PsyDAG**, Monday, March 25, 2013 at 3:18pmHo: mean1 = mean2

Ha: mean1 ≠ mean2

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/probability related to the Z score to see if there is a significant difference in terms of whatever level of significance level you choose.

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