The incidence of breast cancer varies depending on a woman's age. The National Cancer Institute gives the
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Question:
The incidence of breast cancer varies depending on a woman's age. The National Cancer Institute gives the following probabilities for a randomly chosen woman in her 40s who takes a mammography to screen for breast cancer:
What percent of women in their 40s taking a screening mammography receive a positive test result?
97%
13.96%
11.68%
2.28%
If a randomly chosen woman in her 40s taking the mammography screening test gets a positive test result, the probability that she indeed has breast cancer is the positive predicted value, PPV = P(Cancer | Positive test). The PPV for this age group is
0.8368.
0.1632.
0.85.
0.0268.
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