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Students who attend private tuition obtain higher average marks than students who do not. Why would it be incorrect to conclude immediately that tuition alone caused the difference?

Answer and explanation

Correct answer: Other differences, such as prior achievement and access to learning resources, may also influence marks

Students receiving tuition may differ from other students in several ways before tuition begins. These differences can affect academic performance, so a simple comparison of averages cannot establish the effect of tuition alone.

Related tags

Confounding FactorsEducation ResearchCausal InferenceAcademic Performance

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