Suppose 5% of the population have a certain disease.A laboratory blood test gives a positive reading for 95% of people who have the disease.What is the probability of testing positive and having the disease?
A)0.0475
B)0.95
C)0.05
D)0.9
E)0.02

Question

Quizplus · Accepted Answer

The probability of having the disease is 5% or 0.05. The probability of testing positive given having the disease is 95% or 0.95. To find the probability of both having the disease and testing positive, multiply these probabilities: 0.05 * 0.95 = 0.0475.

Suppose 5% of the Population Have a Certain Disease