Evaluate a study design and claim

Untimed practice

Question 1

Researchers recruit 240 volunteers from one after-school program. Students choose whether to use the new study guide or the usual guide. Which conclusion is justified by this design?

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

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