统计学家的目标是从样本中推断出总体是什么。

It’s not given to human beings to have such talent that they can just know everything about everything all the time. But it is given to human beings who work hard at it — who look and sift the world for a mispriced bet — that they can occasionally find one.

造纸行业有责任在环境管理方面引领潮流。