This is where many IB Math AI SL students lose marks. The conclusion looks small, but it decides whether the examiner sees real reasoning or just a calculator answer.
The rule
Your conclusion must include two things:
- Reject H0 or do not reject H0
- The context of the question
Weak answer
Reject H0.
High-scoring answer
Reject H0 — there is sufficient evidence that the variables are dependent.
Why this matters
Without context, your conclusion sounds unfinished. The examiner is not only marking whether you can run a test. They are marking whether you understand what the result means.
Final tip
Always link back to the question. That one extra sentence is often the difference between “almost right” and full marks.
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