IB Biology Extended Essay Exemplar
To what extent does the duration of vaping (in months) affect the forced vital capacity (l) to height (cm) ratio in the population in Hanoi born in 1999-2008?
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Criteria A: Focus and Method
6/6
0
3
6
Criteria Strands
Consistently precise and comprehensive explanation of topic and context
Research question is tightly focused, unambiguous, and sustained throughout
Methodology is well‐justified with a broad range of appropriate techniques and clear procedural detail
Minor gaps in equipment uncertainty reporting and worked examples
Limited discussion of potential confounders such as exercise level
Slightly under‐referenced justification for the chosen FVC/height ratio
Criteria B: Knowledge and Understanding
5/6
0
3
6
Criteria Strands
Wide and appropriate use of current peer‐reviewed sources linked directly to design choices
Terminology and concepts are applied accurately and consistently
Citations are correctly formatted and coherently integrated
Background discussion occasionally drifts into overly detailed cellular biochemistry
Reliance on smoking literature rather than dedicated vaping studies in places
Minor unit and rounding inconsistencies
Criteria C: Critical Thinking
5/12
0
6
12
Criteria Strands
Analysis includes multiple statistical techniques clearly connected to the research question
Evaluation acknowledges key limitations and suggests practical improvements
Argument is generally coherent, logically structured, and supported by data
No formal normality test reported to substantiate non‐parametric choice
Effect‐size calculation and precise p-values are omitted
Some inconsistencies in data labelling and decimal notation reduce clarity
Criteria D: Presentation
2/4
0
2
4
Criteria Strands
Overall structure follows IB guidelines and integrates figures and tables to aid comprehension
Basic formatting requirements (title, word count, page numbers) are met
Key tables are split across pages, disrupting narrative flow
Inconsistent table and figure labelling and overly verbose alt-text reduce readability
Several layout and alignment issues detract from professional appearance