afni.nimh.nih.gov

Ah, *excellent* point!

Even though my reasoning kind of made sense to me, I felt there was something missing -- just couldn't put my finger on it. I am not a statistician either (would be much more embarrassing if I was!), but your creative counterexample very cleverly demonstrate that I was the one to be off-base. Thanks for taking the time to think this through.

cheers,

giuseppe