Evaluate a study design and claim

Untimed practice

Question 1

Researchers recruit 240 volunteers from one after-school program. They randomly assign students to use either a new study guide or the usual guide. Which conclusion is justified by this design?

AThe results show an association for these volunteers but support neither causation nor district-wide generalization. BThe results can support causation for participants but cannot safely generalize to the district population. CThe causal result for the volunteers can be generalized to every student in the same after-school program. DThe results can support a causal conclusion and generalize to the district population.

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