Why do scientists need to be sure they use large numbers when studying populations? 

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lan950s | High School Teacher | (Level 2) Adjunct Educator

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[You question was edited to accord with the eNotes policy that allows one question to be asked and answered per post. You may repost the others as separate Questions.]

All populations have natural variation. If a population study is done and only a small sample was selected then all the variations might not be accounted for in the results. Also, a randomly selected sample is best to ensure that all variations have equal opportunity to be accounted for in the sample.

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