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September 18, 2014

September 18, 2014

Posted by **Nancy** on Monday, April 4, 2011 at 8:52pm.

- math -
**PsyDAG**, Wednesday, April 6, 2011 at 3:14amFind table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion of 5% in the smaller area. (90% leaves 5% in each direction.)

90% confidence interval = mean ± 1.645(SEm)

SEm = SD/√(n-1)

This gives confidence interval for means rather than individual scores.

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