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September 21, 2014

September 21, 2014

Posted by **Beverly** on Friday, April 1, 2011 at 1:25am.

- sample t-test -
**PsyDAG**, Friday, April 1, 2011 at 1:57pmWhat is your question?

Z = (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 your Z score to compare it to your level of significance.

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