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A scientific conclusion was based only on improvement after treatment. Which additional comparison is most necessary?

Answer and explanation

Correct answer: Comparison with a similar untreated group

A comparison group is needed to separate natural change over time from treatment effects. Before-and-after comparison alone may be insufficient.

Related tags

Control GroupBefore After StudyCausationNature And Meaning Of ScienceExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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