If you have ever stared at a table of heart rates and felt your brain quietly power down, you are not alone. In IB SEHS, data can look like a wall of numbers until you remember what the IB actually rewards: clear processing, correct interpretation, and honest evaluation. The students who score well are not “math people”; they are translators. They turn messy results into a story the examiner can trust.
This guide demystifies IB SEHS stats and evaluation so you can analyze like a pro in exams and in your IA.
A quick IB SEHS data checklist (use every time)
Before you calculate anything, run this quick loop:
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Write the research focus in one sentence (what are you testing?)
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Check units on every column (seconds, bpm, cm, kg)
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Decide what summary you need: mean, standard deviation, maybe a comparison
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Look for outliers and note them (do not panic-delete)
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Plan your evaluation points: reliability, validity, limitations, improvements
If you want practice that mirrors how questions are asked, start with the IB SEHS hub and drill topic-by-topic using RevisionDojo’s Questionbank and Study Notes: IB Sports, exercise and health science Resources.
The core stats you must own in IB SEHS
In IB SEHS, you rarely get rewarded for complicated processing when simple processing answers the question well. The foundation is descriptive statistics.
Mean: the “center of the story”
The mean is your headline number.
- Mean = (sum of values) / (number of values)
It is what you compare first (Group A vs Group B, pre vs post, trial 1 vs trial 2). But in IB SEHS, the mean alone is never enough: it tells you where results sit, not how stable they are.
RevisionDojo has clear worked explanations for this exact skill: Calculate the mean and standard deviation notes.
Standard deviation: the “trust meter”
Standard deviation (SD) describes spread around the mean. In plain language: how consistent were the results?
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Low SD: values cluster tightly (more consistent)
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High SD: values are scattered (more variable)
This matters because IB SEHS is full of human performance data. Humans fluctuate. Your job is to show you noticed.
For exam phrasing and comparison language, use: How SD helps compare samples notes and the companion reminder about what SD represents in normal distributions: What SD summarizes notes.
Monitoring exercise intensity (and evaluating your method)
A classic IB SEHS move is to ask you to outline and evaluate ways to monitor intensity. A high-scoring answer names a method, explains what it measures, then critiques it.
Common monitoring options:
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Heart rate (zones or % max HR): practical and cheap, but affected by heat, dehydration, stress, caffeine, and lag during intervals
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Borg RPE scale: captures perceived effort (useful in mixed activities), but subjective and influenced by motivation and experience
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Lactate or VO₂ measures: more objective for thresholds, but expensive and harder to do in school settings
A good evaluation sentence sounds like: “Heart rate is valid for steady-state aerobic work, but reliability may drop in short intervals due to time lag; controlling temperature and standardizing warm-up improves consistency.” That’s IB SEHS thinking.
If Paper 2 data questions are where you freeze, this walkthrough helps you practice the “data -> theory -> evaluation” pattern: Tackle SEHS data-based questions without panicking.
How to write evaluation that earns marks
In IB SEHS, evaluation is not apologizing for your study. It is showing scientific maturity.
Use this simple structure:
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Reliability: Were results consistent? Reference SD, repeated trials, standardized procedure.
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Validity: Did you measure what you intended? Match method to construct (e.g., HR for intensity).
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Limitations: Small sample, uncontrolled variables, measurement error, motivation effects.
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Improvements: Specific fixes (more trials, better controls, calibrated equipment).
For IA-level practice and exam technique, explore more SEHS-specific posts here: All IB SEHS posts.
Conclusion: analyze like an IB SEHS examiner
The secret to IB SEHS data is that numbers are not the point; meaning is. Calculate the mean to describe the center, use SD to judge consistency, choose intensity measures you can defend, and write evaluation that improves the study rather than dismissing it.
When you want to train this skill fast, build a tight loop on RevisionDojo: learn with Study Notes, lock formulas with Flashcards, apply under pressure in the Questionbank, ask AI Chat when you are stuck, then simulate exam conditions with Mock Exams and Predicted Papers. Your data stops being scary when it becomes familiar, and IB SEHS rewards familiar, repeatable method every time.