样本太小是没有意义的。比如一个公共汽车出事故了,如果你光算那个公共汽车上的人的伤亡率,当然就高得吓人。
样本太小是没有意义的。比如一个公共汽车出事故了,如果你光算那个公共汽车上的人的伤亡率,当然就高得吓人。
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