# WST03 Topic Questions — Edexcel IAL Statistics 3 > Edexcel IAL Statistics 3: 5 topics with 437 WST03 topic questions from 21 papers (2014–2026). Browse questions by topic, then open the exact past-paper… - Canonical HTML: https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/ - Markdown mirror: https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/index.md --- Edexcel IAL · Mathematics · A Level Practise WST03 topic questions by topic. 5 topics from the 2014–current syllabus are drawn from 21 papers (2014–2026). Each topic below opens every past-paper question tagged to its syllabus points. - WST03 - 21 papers - 437 topic questions - 1,575 marks - Syllabus 2014–current - [Browse WST03 papers](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-3-wst03/) - [All paper codes](https://www.examsci.com/topics/) Core finding **Estimation, confidence intervals and tests leads WST03 with 181 topic questions and 587 marks across 21 papers.** Goodness of fit and contingency tables follows with 92 topic questions and 419 marks. The current 2014–current dataset covers 5 topics, 437 topic questions and 1,575 marks. Each MCQ or structured part counts as one item, and each topic counts only the parts tagged to it, so the ranking reflects exam exposure rather than the number of question stems. Rows also carry paper count, mark total and year range for cross-unit comparison. The native table reproduces every figure in curriculum order. ## Topic question count and mark distribution Topics are on the vertical axis and sorted from highest to lowest. Only the parts whose knowledge graph matches a topic are counted for that topic, and percentages are each row's share of the tagged total in that chart. A part tagged to several topics is counted in each bar, so the bars are not a partition of the unit total. ### Questions by topic question items - [Estimation, confidence intervals and tests](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/estimation-confidence-intervals-and-tests/) (21 papers) — 181 · 41.0% - [Goodness of fit and contingency tables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/) (21 papers) — 92 · 20.9% - [Regression and correlation](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/regression-and-correlation/) (21 papers) — 64 · 14.5% - [Combinations of random variables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/combinations-of-random-variables/) (21 papers) — 62 · 14.1% - [Sampling](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/sampling/) (17 papers) — 42 · 9.5% ### Marks by topic marks - [Estimation, confidence intervals and tests](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/estimation-confidence-intervals-and-tests/) (21 papers) — 587 · 36.8% - [Goodness of fit and contingency tables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/) (21 papers) — 419 · 26.3% - [Combinations of random variables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/combinations-of-random-variables/) (21 papers) — 305 · 19.1% - [Regression and correlation](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/regression-and-correlation/) (21 papers) — 207 · 13.0% - [Sampling](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/sampling/) (17 papers) — 76 · 4.8% ## Topic comparison matrix Curriculum order is by syllabus number, then alphabetically. Every topic links to its subtopic index. | Topic | Subtopics | Topic questions | Papers | Marks | Years | | | --- | --- | --- | --- | --- | --- | --- | | **[Combinations of random variables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/combinations-of-random-variables/)** | 1 | 62 | 21 | 305 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/combinations-of-random-variables/) | | **[Estimation, confidence intervals and tests](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/estimation-confidence-intervals-and-tests/)** | 8 | 181 | 21 | 587 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/estimation-confidence-intervals-and-tests/) | | **[Goodness of fit and contingency tables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/)** | 2 | 92 | 21 | 419 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/) | | **[Regression and correlation](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/regression-and-correlation/)** | 2 | 64 | 21 | 207 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/regression-and-correlation/) | | **[Sampling](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/sampling/)** | 2 | 42 | 17 | 76 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/sampling/) | ## Browse all topic questions - [Combinations of random variables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/combinations-of-random-variables/) — 62 question items · 21 papers — 1 subtopics · 305 marks · 2014–2026 - [Estimation, confidence intervals and tests](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/estimation-confidence-intervals-and-tests/) — 181 question items · 21 papers — 8 subtopics · 587 marks · 2014–2026 - [Goodness of fit and contingency tables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/) — 92 question items · 21 papers — 2 subtopics · 419 marks · 2014–2026 - [Regression and correlation](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/regression-and-correlation/) — 64 question items · 21 papers — 2 subtopics · 207 marks · 2014–2026 - [Sampling](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/sampling/) — 42 question items · 17 papers — 2 subtopics · 76 marks · 2014–2026 ## Other Mathematics paper codes - [D1 428 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/decision-mathematics-1-wdm11/) - [FP1 649 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/further-pure-mathematics-1-wfm01/) - [FP2 383 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/further-pure-mathematics-2-wfm02/) - [FP3 392 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/further-pure-mathematics-3-wfm03/) - [M1 701 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-1-wme01/) - [M2 637 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/) - [M3 440 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-3-wme03/) - [P1 645 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/pure-mathematics-1-wma11/) - [P2 600 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/pure-mathematics-2-wma12/) - [P3 550 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/pure-mathematics-3-wma13/) - [P4 432 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/pure-mathematics-4-wma14/) - [S1 1,111 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/) - [S2 956 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/) ## Topic questions: rules and edge cases **Where can I find WST03 topic questions?** This page groups every WST03 topic question by topic and syllabus point. Open a topic to see the question numbers, marks and the session each one comes from, then follow the link into the original paper. **How many topics are in the current WST03 syllabus?** This page lists 5 topics tagged to the current syllabus across 21 WST03 papers (2014–2026). Topics are ordered by syllabus number, then alphabetically. **How are question counts and marks calculated?** Each MCQ counts as one question item and each structured part counts as one item. Marks come from the official part marks. Only parts whose knowledge graph matches a topic are counted, and a part tagged to more than one topic is counted against each topic, so topic rows describe exam exposure rather than a partition of the paper. **Why is there no topic chart on the D1 index?** The D1 index intentionally stops at the paper-code level. Topic names are only shown after a code is selected, which prevents two units from claiming the same topic phrase or URL. **Which sessions are included?** All sessions tagged to the current syllabus are included, covering 2014–2026. Questions without a recognised syllabus tag are treated as current so they do not disappear from the index. --- Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/