> What does mean is this - if there actually is no difference between the control and test groups (if the "null hypothesis" is true), how RARE is the data set that I have from my tests?


I've always thought of p-values in terms of chance possibly because it was taught to me that way. But reading no-name's substitution of  "chance" with "rarity" immediately softens judgment about the data set.  If something is indeed rare, that may be all it is. 



Bill H

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