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Originally Posted by abaya
Also, from the following... ... I see no n whatsoever. Also, who decided that the p=0.002 for this "trend?" I'd like to know if this is a common p value and why, because in similar fields of research a p of lower than 0.05 cannot hold water.
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In a given statistical test, the p value is the probability that an observed difference between groups is due to chance, rather than real differences between the two groups. Some fields adopt more stringent cutoffs than .05.
abaya, independent of the studies cited by Jenny, it's generally the other way around. The p value of the test must be lower than .05 "to hold water".