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In an experiment the treatment group received both a new teaching method and extra study time while the control group received neither. What is the main obstacle to interpretation?

Answer and explanation

Correct answer: It cannot be determined which change caused the effect

Changing two factors together prevents their separate effects from being identified. Remember to isolate the main variable.

Related tags

Experimental DesignConfounding VariableCausal InferenceNature And Meaning Of ScienceExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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