Distinguish sample surveys, experiments, and observational studies; explain randomization in each.
Classify a study as a survey, observational study, or experiment
Problem
Is this study an experiment: randomly assign patients to drug or placebo and measure response?
Big Picture
What this problem is really about
Classify the study by tracing what researchers do before measuring the response. Determine whether they simply record existing patient choices or deliberately place patients into the drug and placebo groups, then note that chance controls those assignments. An imposed comparison condition, rather than observation alone, determines the study type and its causal strength.
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