要检验虚假设，需要知道在假设存在随机抽样可变性的情况下获得这么一个极限值的概率。
To test your null hypothesis, you want to know the probability of obtaining a value this extreme under the assumption that it is due to random sampling variability.
研究的极限包括缺乏关于潜在地重要可变物的数据例如药物用途。
Limits of the study included a lack of data on potentially important variables such as drug use.
研究的极限包括缺乏关于潜在地重要可变物的数据例如药物用途。
Limits of the study included a lack of data on potentially important variables such as drug use.
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