statistics

Question
Diagnostic tests of medical conditions can have several types of results. The test result can be either positive (+) or negative (-).  A positive test result does not prove that the patient has the condition, additional medical tests may be required.  Consider a random sample of 200 patients. Condition Present Condition Absent Row Total Test Result + 110 20 130 Test Result – 20 50 70 Column Total 130 70 200 Assume the sample is representative of the entire population.  For a person selected at random, compute the following probabilities: P( + result given condition is present) [This is called the sensitivity of the test] P( – result given condition is present) [This is known as a false-negative] P( – result given condition is absent) [This is known as the specificity of a test] P( + result given condition is absent) [This is known as a false-positive] P( condition present AND positive result)
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