Lecture_week_4

# Lecture_week_4 - Stat 2001 / Stat 6039 Week 4 What is the...

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Stat 2001 / Stat 6039 Week 4

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What is the chance of a false positive? Say you test positive for Chlamydia. What is the probability that you don’t have this infection if the test is 90% accurate? You are now experiencing symptoms and find out that 95% of people who are symptomatic have the infection. What is the probability that you don’t have the infection? STAMP OUT CHLAMYDIA 1 in 14 young people in Canberra have chlamydia, but most don’t know it, because usually there are no symptoms. The SOC (Stamp Out Chlamydia) Project invites you to get a free and confidential test (and free treatment if your test is positive).
When is screening effective? HIV testing is said to be around 99.5% accurate. In San Francisco, 50% of homosexual males are HIV +ve compared to 0.01% in the general US population. What is the false positive rate for each population?

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Prevalence rates and false positives For women in their 40’s, here are the pertinent probabilities: P(cancer) = 1/69 P(no cancer) = 68/69
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## Lecture_week_4 - Stat 2001 / Stat 6039 Week 4 What is the...

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