← Statistics syllabus

EnglandStatistics

The collection of data

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do you collect good data and write fair questions?

Data collection sheets, tally charts, questionnaires, open and closed questions, response boxes and avoiding leading or biased questions.
A focused answer to AQA GCSE Statistics on collecting data, covering data collection sheets and tally charts, open and closed questions, designing non-overlapping response boxes, and how to spot and fix leading or biased questions.
8 min answer →

How do you keep an investigation fair and free of bias?

Explanatory and response variables, controlled and extraneous variables, control groups, and sources of bias in sampling and data collection.
A focused answer to AQA GCSE Statistics on controlling variables and bias, covering explanatory and response variables, controlled and extraneous variables, control groups and matched pairs, and the main sources of bias in sampling and data collection.
8 min answer →

How do you choose a fair sample that represents a population?

Populations, sampling frames, census versus sample, random, systematic, stratified, quota and cluster sampling.
A focused answer to AQA GCSE Statistics on sampling methods, covering populations and sampling frames, census versus sample, and how random, systematic, stratified, quota and cluster sampling work, with the stratified sample calculation.
9 min answer →

How do statisticians turn a question into reliable conclusions?

The statistical enquiry cycle, hypotheses, the stages of an investigation, and types of statistical problem.
A focused answer to AQA GCSE Statistics on the statistical enquiry cycle, covering the stages of an investigation, writing a hypothesis, the role of pilot studies, and how the cycle structures a real statistical problem.
8 min answer →

What kinds of data are there and why does the type matter?

Qualitative and quantitative data, discrete and continuous data, primary and secondary data, and categorical and ranked data.
A focused answer to AQA GCSE Statistics on types of data, covering qualitative and quantitative, discrete and continuous, primary and secondary, categorical and ranked data, and why the type controls which diagrams and calculations you can use.
8 min answer →