AC9M9M04 • Test
Error, bounds and prediction uncertainty
Use the Skillr scratchpad or a notebook to compare predictions with actual values and identify the correct error measure.
SkillrHub quiz practice is built for curriculum-aligned revision with answer feedback and a clear review path.
60-second Quick Read
- Absolute error is the size of the difference: |estimate − actual|.
- Relative error compares the absolute error with the actual value; percentage error multiplies that by 100.
- Common trap: For rounded measurements, the maximum error is half of the rounding unit.
SkillrHub Test guide
Use this short shuffled test set to check the skill, read feedback and review missed items. Repeat quiz practice to access more of the full question bank over time.
- Worked example: Before answering, classify what the question gives, what it asks for, and which curriculum idea links them. For Error, bounds and prediction uncertainty, explain the evidence or method in one complete sentence before selecting the final answer.
- Common mistake: Do not match answers by familiar wording only. Check the full AC9M9M04 idea, the units or evidence, and any exception in the stem.
- Assessment guidance: Use this short shuffled set for one attempt. Repeat quiz practice to get access to more of the full question bank over time.
- SkillrHub review path: Use feedback to name the misconception, practise a corrected example, and retest only after you can justify the answer aloud.
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