Make a headline match the evidence
Revise scope, certainty and causality in an evidence summary.
Supplied materials
- Original fictional report excerpt: “Twenty volunteers tried a new vocabulary game for one week. Their average score on the same ten-item practice check rose from 6 to 8. There was no comparison group, and the check repeated the same items.”
- Original exaggerated headline: “Game guarantees lasting language mastery for every learner.”
Learn the idea
A precise summary names who was studied, what was measured and how far the evidence reaches. A short practice-check change differs from mastery across a language or lasting retention.
Repeated items, voluntary participation and the lack of a comparison group affect interpretation. These limitations do not erase the observed scores, but they prevent the report from isolating the game’s effect or guaranteeing results for everyone.
- Underline the measured outcome and time period.
- Calculate the observed average score change.
- Mark each unsupported term in the headline: guarantees, lasting, mastery and every.
- Write a replacement headline and a one-sentence limitation.
See the method in action
“Volunteer group’s vocabulary practice scores rose over one week.” Scores increased by 2 points out of 10 on average, but repeated items and no comparison group mean the change cannot be attributed solely to the game.
Check your reasoning
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See the answer and explanation
Twenty volunteers’ average score rose from 6 to 8 on a repeated practice check.
The final headline accurately states the group, average, score change and measurement. The study does not establish a guarantee, comprehensive mastery or lasting retention; a limit is not proof of no observed change.
Take it further
Draft a follow-up design with a later check using new items and a relevant comparison group. State the remaining uncertainty even if that study also shows a difference.
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Longer courses for learners ages 14+
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