Question

Diagnostic tests of medical conditions can have several types of results. The test result can be positive or negative, whether or not a patient has the condition. A positive test (+) indicates that the patient has the condition. A negative test (-) indicates that the patient does not have the condition. Remember, a positive test does not prove the patient has the condition. Additional medical work may be required. Consider a random sample of 200 patients, some of whom have a medical condition and some of whom do not. Results of a new diagnostic test for a condition are shown. Condition Present Condition Absent Row Total Test Result + Test Result- Column Total 104 21 125 26 49 75 130 70 200 Assume the sample is representative of the entire population. For a person selected at random, compute the following probabilities. (Enter your answers as fractions.) (a) Pl+ I condition present); this is known as the sensitivity of a test (b) P- I condition present); this is known as the false-negative rate. (c) P- I condition absent); this is known as the specificity of a test (d) Pl+ I condition absent); this is known as the false-positive rate. (e) P(condition present and +); this is the predictive value of the test. (F) Plcondition present and -)

Answer 1

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