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United StatesStatisticsQuick questions

Unit 4: Probability, Random Variables, and Probability Distributions

Quick questions on Conditional probability - AP Statistics Unit 4

2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?
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P(A and B)=0.12P(A \text{ and } B) = 0.12 and P(B)=0.3P(B) = 0.3. Find P(A∣B)P(A \mid B). [2 points]
What is q2?
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A test is positive 95%95\% of the time when a rare disease is present. Why might P(disease∣positive)P(\text{disease} \mid \text{positive}) still be low? [1 point]

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