A starting point for discussion
The idea
AI-written statements averaged 125.9 words (95% confidence interval: a range that reflects uncertainty in the estimate, from 121.4 to 130.1), compared with 105 words for human-written statements (100.2 to 108.5). Length affected ratings and rankings. However, participants still supported the AI statements more in their endorsement ratings after the researchers accounted for length.
Place in the reasoning
AI assessment · Connected to reasoning
Reports longer AI statements and that length affected ratings and rankings, while endorsement preference remained after controlling for length.
Faster discussion and positive ratings do not prove a tool is ready for public decisions
The length effect qualifies interpretation of statement comparisons; the remaining endorsement result does not establish every other quality dimension or practical readiness.
What this means and why it matters
What this means
The AI statements averaged about 126 words, versus 105 for human statements. Length affected ratings and rankings, but the AI statements remained ahead on endorsement ratings when length was taken into account.
Why it matters
The reported figures show the size of the length difference being considered. When the researchers accounted for length, the results suggest that length alone did not explain the endorsement difference. Length still influenced responses.
Conditions & assumptions
Source coverage: Full readable text of the 10-page Science article copy, including references. Supplementary materials are not included. The passage identifies length as a possible explanation, reports the average lengths, and says the endorsement difference remained after controlling for length. It does not say length had no effect on other ratings or rankings. Addresses: Effect of statement length
Questions this connects to
AI-suggested relationships. Authors have not necessarily responded to one another.