sensitive as 0.55 specificity as 0.45 Questions ... 1-what is the positive predictive value of the...
sensitive as 0.55
specificity as 0.45
Questions ...
1-what is the positive predictive value of the digit rectal exam for prostate cancer in men if the prevalence is 21 per 1,000 men .
2- what is the probability of a false negative test
3- what is the probability of a false positive test
Homework Answers
1)
P(tested positive) =P(have prostate cancer)*P(tested positive|have prostate cancer)+P(not have prostate cancer)*P(tested positive|not have prostate cancer)
=(21/1000)*0.55+(1-21/1000)*(1-0.45)=0.55
positive predictive value
=P(have prostate cancer)*P(tested positive|have prostate cancer)/P(tested positive)
=(21/1000)*0.55/0.55
=0.021
2)
P(false negative) =1- sensitivity =1-0.55 =0.45
3)
probability of a false positive test =1- specificity =1-0.45 =0.55
Add Answer to:
sensitive as 0.55
specificity as 0.45
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