Posted by **Phil** on Sunday, March 16, 2014 at 1:18am.

Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class.

- Statistics (?) -
**PsyDAG**, Sunday, March 16, 2014 at 8:30pm
No data given.

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. It is less that your level of significance?

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