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A common respiratory ailment afflicts 25% of the people in a large city. A screening test yields a true-positive result 99% of the time and

A common respiratory ailment afflicts 25% of the people in a large city. A screening test yields a true-positive result 99% of the time and a false-positive result 1% of the time. What are the sensitivity and specificity of the test? What are the positive and negative predictive values of the test? What is the relative risk of having the ailment given a positive test?

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