# WST03 Goodness of fit and contingency tables Topic Questions

> Edexcel IAL WST03: every Goodness of fit and contingency… topic question from 21 papers (2014–2026), grouped by syllabus point. 92 questions, 419 marks,…

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Edexcel IAL · Mathematics · WST03 · A Level

Every WST03 Goodness of fit and contingency tables topic question from the 2014–current syllabus, drawn from 21 papers (2014–2026) and grouped by syllabus point. Each row opens a page listing the exact question numbers, marks and a direct link into the paper. These are questions by topic, not full papers, so you can revise one topic at a time.

- WST03
- 2 subtopics
- 92 topic questions
- 21 papers
- 419 tagged marks
- [Back to Goodness of fit and contingency tables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/)
- [All paper codes](https://www.examsci.com/topics/)

Core finding

**4.1 The null and alternative hypotheses. The use of … as an… is the most frequently assessed subtopic in Goodness of fit and contingency tables, with 90 topic questions and 416 marks across 21 papers.** 4.2 Degrees of freedom. follows with 47 topic questions and 331 marks. The topic contains 2 subtopics, 92 topic questions and 419 marks in total. Rows count only the parts tagged to that subtopic, keep the same colour in both charts and repeat paper count, tagged marks and year range in the native table.

## Topic question count and mark distribution

Subtopics are on the vertical axis and sorted from highest to lowest. Only the parts whose knowledge graph matches a subtopic are counted for it, and percentages are each row's share of the tagged total in that chart. A part tagged to several subtopics is counted in each bar, so the bars are not a partition of the topic total.

### Questions by subtopic

question items

- [4.1 The null and alternative hypotheses. The use of $\sum_{i=1}^{n}\frac{(O_{i}-E_{i})^{2}}{E_{i}}$ as an approximate $\chi^{2}$ statistic.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-1-the-null-and-alternative-hypotheses-the-use-of-sum-i-1-n-frac-o-i-e-i-2-e-i-as-an/) (21 papers) — 90 · 65.7%
- [4.2 Degrees of freedom.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-2-degrees-of-freedom/) (21 papers) — 47 · 34.3%

### Marks by subtopic

marks

- [4.1 The null and alternative hypotheses. The use of $\sum_{i=1}^{n}\frac{(O_{i}-E_{i})^{2}}{E_{i}}$ as an approximate $\chi^{2}$ statistic.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-1-the-null-and-alternative-hypotheses-the-use-of-sum-i-1-n-frac-o-i-e-i-2-e-i-as-an/) (21 papers) — 416 · 55.7%
- [4.2 Degrees of freedom.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-2-degrees-of-freedom/) (21 papers) — 331 · 44.3%

## Subtopic comparison matrix

Curriculum order is by syllabus number, then alphabetically. Every row links to the matching past-paper question list.

| Subtopic | Topic questions | Papers | Marks | Years | |
| --- | --- | --- | --- | --- | --- |
| **[4.1 The null and alternative hypotheses. The use of $\sum_{i=1}^{n}\frac{(O_{i}-E_{i})^{2}}{E_{i}}$ as an approximate $\chi^{2}$ statistic.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-1-the-null-and-alternative-hypotheses-the-use-of-sum-i-1-n-frac-o-i-e-i-2-e-i-as-an/)** | 90 | 21 | 416 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-1-the-null-and-alternative-hypotheses-the-use-of-sum-i-1-n-frac-o-i-e-i-2-e-i-as-an/) |
| **[4.2 Degrees of freedom.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-2-degrees-of-freedom/)** | 47 | 21 | 331 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-2-degrees-of-freedom/) |

## Browse every topic question

- [4.1 The null and alternative hypotheses. The use of $\sum_{i=1}^{n}\frac{(O_{i}-E_{i})^{2}}{E_{i}}$ as an approximate $\chi^{2}$ statistic.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-1-the-null-and-alternative-hypotheses-the-use-of-sum-i-1-n-frac-o-i-e-i-2-e-i-as-an/) — 90 question items · 21 papers — 416 marks · 2014–2026
- [4.2 Degrees of freedom.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/goodness-of-fit-and-contingency-tables/4-2-degrees-of-freedom/) — 47 question items · 21 papers — 331 marks · 2014–2026

## Other topics in WST03

- [Combinations of random variables 62 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/combinations-of-random-variables/)
- [Estimation, confidence intervals and tests 181 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/estimation-confidence-intervals-and-tests/)
- [Regression and correlation 64 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/regression-and-correlation/)
- [Sampling 42 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-3-wst03/sampling/)

## Topic question rules and edge cases

**How many subtopics does Goodness of fit and contingency tables contain?**

This page lists 2 subtopics tagged to the current syllabus. They are ordered by syllabus number, then alphabetically, and each row opens a page of matching past-paper questions.

**How are the subtopic question and mark totals calculated?**

A multiple-choice question contributes one item and its marks to every subtopic it is tagged with. A structured question contributes one item per tagged part, and that part’s marks; untagged parts of the same question are not counted here. A part tagged to several subtopics therefore appears under each of them.

**Why do some subtopics have no numbered prefix?**

Practical-skills statements and some syllabus bullets are unnumbered. Numbered statements come first; unnumbered statements and ties are sorted alphabetically.

**Is the LaTeX rendered without JavaScript?**

Yes. Subtopics that contain formulas are converted to static KaTeX HTML during the build, and the KaTeX stylesheet is served from the same site.

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