A physician is currently interested in a new test to identify the presence of sk
ID: 3273251 • Letter: A
Question
A physician is currently interested in a new test to identify the presence of skin cancer. Below is a table representing his results after testing on 1000 patients.
Disease Status Test Result
Total
+ -
Skin Cancer 351 116 467
No Skin Cancer 92 441 533
Total 443 557 1000
What is the sensitivity of the test?
What is the specificity of the test?
What is the prevalence of skin cancer?
What is the probability of a false positive?
What is the positive predictive value (PPV) of the test?
What is the probability that a randomly chosen person has skin cancer and has a positive test result?
Explanation / Answer
sensitivity of the test=351/467 =0.7516
specificity of the test =441/533=0.8274
prevalence of skin cancer =467/1000=0.467
probability of a false positive =1-specificity =1-0.8274=0.1726
positive predictive value (PPV) of the test =351/443=0.7923
probability that a randomly chosen person has skin cancer and has a positive test result =351/1000=0.351
test result disease status positive negative total positive 351 116 467 negative 92 441 533 total 443 557 1000Related Questions
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