hard · GRE Verbal
Researchers studying street-tree initiative observed that summer sidewalk temperatures declined after trees matured. They concluded that tree canopy caused the decline. The result is suggestive, but the city also replaced dark pavement with reflective material; unless that possibility is addressed, the causal claim remains provisional. Which choice best describes the primary purpose of the passage?
- To present a causal interpretation and explain why the evidence does not yet securely establish it
- To report only that the observed outcome changed after the intervention, without evaluating any causal interpretation
- To prove that the proposed intervention should be abandoned because it can never produce the desired outcome
- To describe the historical development of research on the topic and identify the field’s dominant tradition
- To compare the intervention’s effectiveness with several alternative programs designed for the same population
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