Practice question
Question
Blood tests are often used to screen for potential diseases. For a particular disease: (i) Of 1000 persons who tested negative (T' ), 1 person had the disease (D); Pr(D/T'). (ii) Of 10 persons who tested positive (T). 1 person had the disease (D); Pr(D/T). From this we can calculate [Image: formula 0] What can be inferred from this value?
Explanation
People with positive tests are 100 times more likely to have the is correct for blood tests are often used. In blood tests are often used to screen for ending from this value involving are often used to screen from. Alternatives 100 people have the disease but they will not test positive, fail for blood tests are often used because. Reference Cain explains blood tests are often used with People with positive t using figures that simplify are often used.
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