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
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 of200 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 + | 100 | 30 | 130 |
Test Result | 25 | 45 | 70 |
Column Total | 125 | 75 | 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) P(+ | condition present); this is known as thesensitivityof a test. .37 (b) P(| condition present); this is known as thefalse-negative rate. (c) P(| condition absent); this is known as thespecificityof a test. (d) P(+ | condition absent); this is known as thefalse-positive rate. (e) P(condition presentand+); this is thepredictive valueof the test. (f) P(condition presentand).
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