Edexcel GCSE Statistics (1ST0): complete guide to the collection of data, processing and analysis, probability and the exams

Pearson Edexcel GCSE (9-1) Statistics (specification 1ST0) is a single linear course assessed by two written papers sat at the end of the course. There is no coursework. The whole qualification is framed by the statistical enquiry cycle, and both papers integrate the cycle with the statistical methods. This page is the index: below is a map of the three content areas, the tier structure, the exam papers, the formulae sheet, and how to study each area, with a direct link to every dot point.

The three content areas

The specification is organised into three areas, all set within the statistical enquiry cycle.

1. The collection of data

Planning an enquiry and writing a hypothesis, recognising constraints, types of data (quantitative, qualitative, categorical, ordinal, discrete, continuous, grouped, bivariate), populations and sampling (random, systematic, stratified, quota, cluster, judgement and convenience), collecting data and designing questionnaires, reliability and validity, and controlling variables and bias.

2. Processing, representing and analysing data

Tabulation and diagrams (two-way tables, pictograms, pie charts, stem and leaf, Venn diagrams), charts and graphs (bar charts, line graphs, frequency polygons, cumulative frequency, histograms, box plots), measures of central tendency (mode, median, mean, weighted and geometric mean), measures of dispersion (range, IQR, percentiles, standard deviation), standardised scores, skewness and outliers, index numbers and rates of change, scatter diagrams and correlation, regression, Spearman's rank and PMCC, time series, quality assurance and estimation.

3. Probability

Estimating probability from data, the probability scale and likelihood, expected frequency, relative and absolute risk, comparing experimental with theoretical results, two-way tables, sample space, tree and Venn diagrams, mutually exclusive and exhaustive events, the addition and multiplication laws, conditional probability and independence, and (Higher tier) the binomial and Normal distributions.

The statistical enquiry cycle

The order of the content follows the five stages of the enquiry cycle, and both papers assess the component parts of it:

1. Plan. Define a question or hypothesis, decide what data to collect and how, and plan the processing and representation.
2. Collect. Source primary or secondary data, choose a sampling method, and design collection sheets and questionnaires.
3. Process and represent. Clean the data, calculate summary statistics, and draw appropriate diagrams.
4. Interpret. Analyse the diagrams and calculations and reach conclusions that relate to the hypothesis in context.
5. Evaluate. Make inferences and predictions, identify weaknesses, and suggest improvements and refinements.

Foundation and Higher tiers

The qualification is tiered. You sit both papers at one tier.

• Foundation tier targets grades 1 to 5 and covers the core enquiry cycle, data types, sampling, charts and graphs, averages and basic spread, simple correlation, time series, index numbers and basic probability.
• Higher tier targets grades 4 to 9 and adds standard deviation and standardised scores, the equation of the regression line, Spearman's rank and PMCC, quality assurance control charts, the Petersen capture-recapture method, and the binomial and Normal distributions.

Exam structure

Edexcel GCSE Statistics is assessed by two written papers, both sat at the end of the course.

• Paper 1 (code 1ST0/1F or 1ST0/1H). Calculator allowed. 1 hour 30 minutes, 80 marks, 50%.
• Paper 2 (code 1ST0/2F or 1ST0/2H). Calculator allowed. 1 hour 30 minutes, 80 marks, 50%.

Both papers assess content from across the whole specification and integrate the statistical enquiry cycle, so you cannot revise paper by paper.

The formulae sheet

Edexcel provides a formulae sheet in both papers, including the standard deviation formulae, the skewness formula $\frac{3(\text{mean} - \text{median})}{\text{standard deviation}}$, Spearman's rank correlation coefficient, and standardised population rate formulae. Some formulae are expected to be known and are not given, including the standardised score $\frac{x - \mu}{\sigma}$, the mean of a binomial distribution $np$, the outlier rules and the control-line rules. Learn which is which, because the sheet does not tell you when to apply a formula.

How to study Edexcel Statistics

Statistics rewards accurate calculation, clear interpretation in context, and treating the subject as a process.

1. Work from the specification statements. Each content code (for example 1c.06 on stratification, 2c.06 on standardised scores, 3p.12 on the Normal distribution) is a checklist; questions are written from them.
2. Master the collection of data first. A flawed sample or biased question invalidates every later calculation, so the foundations matter.
3. Show full working. Method marks are secure even when an answer slips, so set out every step of a calculation.
4. Always interpret in context. Marks are lost by quoting a statistic without saying what it means for the hypothesis, so finish every calculation with a sentence of interpretation.
5. Finish with timed past papers. Sit full papers across both to build speed and exam stamina, and to practise the integrated enquiry-cycle questions.

Syllabus, dot point by dot point

Each area has specification-statement-level answer pages with worked exam questions and cross-links, plus an overview guide and quiz. Browse the full set at /gcse-edexcel/statistics/syllabus.

The collection of data

• The statistical enquiry cycle
• Types of data
• Sampling methods
• Collecting data and questionnaires
• Controlling variables and bias

Processing and representing data

• Tabulation and diagrams
• Statistical charts and graphs
• Histograms and continuous data
• Cumulative frequency and box plots

Summarising data

• Measures of central tendency
• Measures of dispersion
• Standard deviation and standardised scores
• Skewness and outliers

Scatter diagrams and correlation

• Correlation and causation
• Lines of best fit and regression
• Spearman's rank and PMCC

Time series and index numbers

• Time series and moving averages
• Index numbers
• Rates of change and crude rates

Probability

• Probability basics and relative frequency
• Combined events and diagrams
• Conditional probability and independence
• Risk and expected frequency

Statistical distributions

• The binomial distribution
• The Normal distribution
• Quality assurance and control charts

Statistical inference

• Estimating population characteristics
• Capture-recapture and sample size

For the official specification

Pearson publishes the full specification (1ST0), past papers and mark schemes at qualifications.pearson.com. Always revise from the current specification and Edexcel's own past papers, because question style is board-specific.