Question 36·Hard·Rhetorical Synthesis
While researching a topic, a student has taken the following notes:
- 2018–2022 multi-city study spanning 20 midsize US cities.
- Each 10% increase in neighborhood tree-canopy coverage was associated with an average summer afternoon land-surface temperature reduction of 0.9°C (city-specific range: 0.5–1.4°C).
- Cooling corresponded to mean residential electricity demand reductions of 4–6% during peak months; median household savings were about $25–$38 per month in July–August.
- Daytime comfort index improved with added canopy, but overnight temperatures changed less (<0.3°C).
- Neighborhoods below 80% of a city’s median income began with 11 percentage points less canopy on average but showed equal temperature response per added canopy.
The student wants to write a one-sentence overview that captures the study’s principal conclusion, emphasizing overall effects (including how results applied across income levels) rather than technical details. Which choice most effectively uses relevant information from the notes to accomplish this goal?
For rhetorical synthesis, first identify the 2–3 most important results in the notes (usually the main effects and any key comparison, like across groups). Then choose the option that combines those results into a single broad claim. Eliminate choices that (1) focus on one detail, (2) describe methods instead of findings, or (3) subtly contradict a key relationship in the notes (for example, misrepresenting how outcomes differed by income level).
Hints
Prioritize outcomes over measurements
Look for a sentence that states what increased tree canopy did (effects), not one that lists what researchers tracked or gives a narrow statistic.
Include the cross-neighborhood takeaway
One bullet compares lower-income neighborhoods to others. The best overview should reflect that point accurately without diving into exact percentages.
Check for completeness and accuracy
The strongest overview should cover both major outcomes (cooling and electricity demand) and should not contradict the note about equal temperature response in lower-income neighborhoods.
Step-by-step Explanation
Restate the goal of the sentence
The student needs a one-sentence overview of the study’s principal conclusion, focusing on overall effects (not lists of measurements or precise ranges) and including how results applied across income levels.
Extract the main conclusions from the notes
From the notes, the broad takeaways are:
- More tree canopy is associated with cooler summer afternoons.
- That cooling corresponds to lower peak-month residential electricity demand.
- Lower-income neighborhoods started with less canopy, but the temperature response per added canopy was equal (similar cooling benefit).
Test each choice against those takeaways
- Choice A includes afternoon cooling, reduced electricity demand, and correctly states similar cooling benefits in lower-income neighborhoods.
- Choice B sounds similar but contradicts the notes by claiming smaller cooling gains in lower-income neighborhoods.
- Choice C includes cooling but shifts to comfort/overnight temperature and leaves out the electricity-demand effect.
- Choice D includes electricity-demand/cost effects but downplays the main cooling conclusion and omits the income-level applicability.
Choose the best overview sentence
The only option that accurately combines the study’s key overall effects and the across-income-level result is: Across 20 midsize US cities, increased tree canopy cooled summer afternoons and reduced peak-month residential electricity demand, with similar cooling benefits in lower-income neighborhoods.