You have to make those calculations and there are errors in that, but you come away with a population estimate of things like that.

你必须把这些都算进去,因为其中存在误差,但这样你会得出,整体人群摄取量的估算值

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

By the way, here's where the average error is in this particular study.

顺便一提,这是这个实验的平均误差值

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选