Question

The prostate-specific antigen (PSA) test is a simple blood test to screen for prostate cancer. It has been used on men over 50 as a routine part of a physical exam, with levels above 4 ng/mL indicating possible prostate cancer. The test result is not always correct, sometimes indicating possible prostate cancer when it is not present and often missing prostate cancer that is present. Here are the approximate conditional probabilities of a positive test result (+) and negative test result (-), given the cancer is present (Present) or the cancer is absent (Absent): P(+|Present)=0.21, P(-|Absent)=0.79, P(+|Absent)=0.06, P(-|Absent)=0.94, Assume that, for the population of men over 50, 6.3% have prostate cancer. What is the probability that a randomly selected male over 50 selected will yield a positive PSA test result? That is, find P(+). (Round your answer to four decimal places.)

          The prostate-specific antigen (PSA) test is a simple blood test to screen for prostate cancer.  It has been used on men over 50 as a routine part of a physical exam, with levels above 4 ng/mL indicating possible prostate cancer.  The test result is not always correct, sometimes indicating possible prostate cancer when it is not present and often missing prostate cancer that is present.  Here are the approximate conditional probabilities of a positive test result (+) and negative test result (-), given the cancer is present (Present) or the cancer is absent (Absent):

P(+|Present)=0.21,

P(-|Absent)=0.79,

P(+|Absent)=0.06,

P(-|Absent)=0.94,

Assume that, for the population of men over 50, 6.3% have prostate cancer.  What is the probability that a randomly selected male over 50 selected will yield a positive PSA test result? That is, find P(+).  (Round your answer to four decimal places.)

Added by Ginni S.

Question

Please give Ace some feedback