AC9M9ST02 • Test
Sampling bias and representativeness
Use the Skillr scratchpad or a notebook to compare sample proportions with target population proportions and calculate coverage gaps.
SkillrHub quiz practice is built for curriculum-aligned revision with answer feedback and a clear review path.
60-second Quick Read
- A sample can be biased if important groups are missing, under-represented or difficult to reach.
- Representativeness can be checked numerically by comparing sample percentages with target population percentages.
- Common trap: A large total sample can still be biased if the sampling method excludes part of the population.
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 Sampling bias and representativeness, 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 AC9M9ST02 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.
5This attempt
0Best score
Score: 0