A common blood test indicates the presence of a disease 95% of the time when the disease is actually present in an individual. One percent of people have the disease. The specificity of the test is 0.95. That is, if a person is free of the disease, then the probability that the test comes back negative is 0.95.

a. Fill in the probabilities below:

P(Disease) =

P(No Disease) =

P(Pos Test|Disease) =

P(Neg Test|Disease) =

P(Pos Test|No Disease) =

P(Neg Test|No Disease) =

b. Find the probabilities below:

a person has the disease and tests positive

a person does not have the disease and tests positive

a person has the disease if the blood test is positive for the disease