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October 22, 2014

October 22, 2014

Posted by **Mike** on Monday, June 18, 2012 at 10:55pm.

- Statistics -
**PsyDAG**, Tuesday, June 19, 2012 at 10:39amZ = (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 related to the Z score.

- Statistics -
**Anonymous**, Friday, June 22, 2012 at 12:24pmThe probability of being a smoker for a population of college students is 0.20.The standard deviation for samples of 1600 students is 0.01. The standard deviation would be smallest for which of these sample sizes?

A) 16

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