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August 1, 2014

August 1, 2014

Posted by **natasha** on Saturday, December 4, 2010 at 4:48pm.

- statistic -
**PsyDAG**, Sunday, December 5, 2010 at 11:59amWe have no access to your sample data.

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.

Remember that:

Ho: mean = 172

Ha: mean ≠ 172

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