Do whatever study you want, but if you play golf with enough different people you'll run across some who can't hit very far regardless how much they try (they do not properly apply enough club head speed to hit a long ball - end of story) and other guys who seem to hit it far no matter which club they have in their hands or how many balls they hit. IMHO, a study where dozens of any shot are hit consecutively is pointless, because it has no bearing on rounds played (i.e.when knowing your distances actually matters- who really cares about driving range distances?).
With respect to your last parenthetical.... I never get much of a feeling of confidence or any real data on distances on a range. Its bloody pointless to me for anything other than whether or not I've got the shanks and how to fix it. The course is the only place where I can learn distances with any reliability. So that rings quite true.
I'm collecting data thus far, and sooner or later I'll have some statistical averages, but it takes time on the course. I think my range distances would probably be a bit better than those on the course, so it does me little good even if I know.