SAT Reading & Writing · Command of Evidence (quantitative)
A researcher claims that the intervention produced uniformly better performance. Which choice most effectively uses the data to qualify…
Researchers tested whether an intervention changed both average performance and variability.
| Condition | Mean score | Standard deviation |
|---|---|---|
| Control | 71 | 8 |
| Intervention | 78 | 14 |
A researcher claims that the intervention produced uniformly better performance. Which choice most effectively uses the data to qualify the claim?
| Condition | Mean score | Standard deviation |
|---|---|---|
| Control | 71 | 8 |
| Intervention | 78 | 14 |
A researcher claims that the intervention produced uniformly better performance. Which choice most effectively uses the data to qualify the claim?
Answer and explanation
Answer: A: The intervention group had a higher mean score but also substantially greater variability, so the table does not show that every participant performed better.
A integrates both columns. The higher mean supports improvement on average, while the larger spread prevents a claim of uniform individual improvement.
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