Disco Fever is randomly found in one half of one percent of the general population.Testing a swatch of clothing for the presence of polyester is 99% effective in detecting the presence of this disease.The test also yields a false-positive in 4% of the cases where the disease is not present.What is the probability that the test result comes back negative if the disease is present?
A)0.89
B)0.01
C)0.96
D)0.04

Question

Quizplus · Accepted Answer

The probability that the test result comes back negative if the disease is present is 1 - 0.99 = 0.01, because the test is 99% effective in detecting the disease, meaning it fails to detect it 1% of the time.

Disco Fever Is Randomly Found in One Half of One