Distinguish sample surveys, experiments, and observational studies; explain randomization in each.
Decide whether a causal conclusion is justified
Problem
Does this study design support a causal conclusion: randomized controlled experiment?
Big Picture
What this problem is really about
Causal support comes from imposing treatments, using a comparison condition, and assigning units by chance so groups are comparable in expectation. When other study conditions are adequately controlled, a systematic response difference can be attributed to the treatment for the experimental participants under the design's assumptions. Broader population generalization remains a separate question governed by recruitment or sampling.
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