1. CPK and SGOT tests are used in the diagnosis of myocardial infarction (MI). When the...

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1. CPK and SGOT tests are used in the diagnosis of myocardialinfarction (MI). When the CPK test is given to a patient who doesnot have a MI, the probability of a negative finding (i.e. itsspecificity) is 0.6. The probability that the SGOT test will benegative for a non-MI patient is 0.7. When both tests are given toa non-MI patient the probability that at least one is negative is0.9. For a non-MI patient who has both tests:
What is the probability that both tests are negative?
What is the probability that both tests are positive?
Hints: (1) Answer is not 0.12 -- testsare not to be assumed to be independent.
Â Â Â Â Â Â Â Â Â Â (2)Using 2-by-2 table to structure your calculations can help.
What is the probability that at least one test ispositive?

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P Negative finding of CPK test for patient who does not have a MI 06 P Negative finding of SGOT test for patient who does not have a MI 07 P Negative finding of at least one test for patient who does not have a MI 09 a What is the probability that both tests are negative P Negative finding See Answer

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