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hmmm i the guy under me was right
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philosophical thought help them by fis???
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In an observational study, we measure or survey members of a sample without trying to affect them. In a controlled experiment, we assign people or things to groups and apply some treatment to one of the groups, while the other group does not receive the treatment.
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A Venn diagram may also be called a primary diagram, set diagram or logic diagram. It is a diagram that shows all possible logical relations between a finite collection of different sets. ... In Venn diagrams, the curves are overlapped in every possible way.
