Two-way tables
What Two-way tables means in Mathematics A-Level, as defined for AQA, Pearson Edexcel, WJEC.
Definitions of Two-way tables
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Reference: Pearson Edexcel
Organise counts by two categories, and conditional probability is a row or column proportion, not a proportion of the whole table.
A representation giving counts, so the count in the overlap is divided by the total for the condition.
Conditional probabilities are found by restricting attention to a specific row or column total.
Topics that use Two-way tables
- M: Probability (AQA A-Level)
- Probability (Pearson Edexcel A-Level)
- Probability (A2 Unit 4: Applied Mathematics B) (WJEC A-Level)
Related terms
- Conditional probability
- Tree diagrams
- conditional probability formula
- Event
- Independent events
- mutually exclusive events
- sample space
- addition rule
Using Two-way tables in the exam
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