Or all the 90s studies about how small (k-12) schools were so much more effective than large ones, and it turned out to just be an artifact of the data. Smaller

Or all the 90s studies about how small (k-12) schools were so much more effective than large ones, and it turned out to just be an artifact of the data. Smaller schools had much more dispersion in outcomes, just as you’d expect. So they had both the best and worst outcomes.