Objective
Recognise populations, samples, bias and limits of conclusions.
Calculator: Non-calculator core; calculator optional only for checking where labelled.
Points route: Connect 2 · Share 2 · Apply 6 · Review 3 · Stretch 2 · Deep Challenge 3. Record your score honestly after you have checked your answer.Recall
Retrieve the key fact or method needed for sampling and data quality.
Core practice
A school has 800 learners, 200 in Year 11. How many Year 11 learners belong in a proportional sample of 64?
Reasoning
A survey about canteen food is sent only to the school's sports team. Give two distinct sources of bias and improve selection.
Exam-style
Evaluate a data collection method. Identify one source of bias, improve the method and state one remaining limitation.
Recall & Review: feedback and extension integration
Lesson L045: Sampling and data quality
Objective: Recognise populations, samples, bias and limits of conclusions.
60-minute structure: 0-7 Connect & Check; 7-14 Share; 14-25 Present/model; 25-44 Apply route choice/practice; 44-52 independent exam-style check; 52-60 Recall & Review, WWW/EBI and next step.
What Went Well (WWW)
I selected an appropriate statistic or representation and supported my comparison or interpretation with specific evidence from the data.
Even Better If (EBI)
I will quote the relevant values or features, compare like with like and explain what the evidence shows without making an unsupported claim.
Stretch and deep challenge
Stretch: A school has 800 learners, 200 in Year 11. How many Year 11 learners belong in a proportional sample of 64?
Deep challenge: A survey about canteen food is sent only to the school's sports team. Give two distinct sources of bias and improve selection.