Originally Posted by ultramarina
I think it's best to review the actual article (which actually is quite heavy on the stats indeed) before we start taking potshots at the simplistic NPR coverage. I'm distracted at the moment, but I'm not actually grasping the original article that well myself; however, it's definitely occurred to me to wonder why we assume that the bell curve is a constant.

Because the Central Limit Theoren says that for *any* distribution of an underlying variable, for a large enough value of N, a normal distribution will be observed.