That is why there is a need of large population
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送交者: cornbug 于 2013-06-18, 23:17:12:
回答: there're people did eat and not eat. 由 whatistruth 于 2013-06-18, 23:12:53:
If the study population is large enough, those individuals who don't eat will become insignificant (bias removed).
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