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Check whether the condition changes probability - Paper 2

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Choose one record uniformly from this complete two-way table. Counts: A and B=9; A and not B=3; not A and B=3; neither=1. Every record appears once, with no missing categories. Compare unconditional P(B) with P(B given A); the condition changes the denominator to the A group.

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