A screening test is used in the same way in two similar populations, but the pro

Question

A screening test is used in the same way in two similar populations, but the proportion of false-positive results among those who test positive in population A is higher than that among those who test positive in population B. What is the most likely explanation for this finding?

a. The specificity of the test is higher in population A

b. The specificity of the test is lower in population A

c. The prevalence of disease is higher in population A

d. The prevalence of disease is lower in population A

a. The specificity of the test is higher in population A

b. The specificity of the test is lower in population A

c. The prevalence of disease is higher in population A

d. The prevalence of disease is lower in population A

Explanation / Answer

The test was conducted as the same way in both the population.

Population A shows a greater number of false positive results than population B.

Thus the problem is direct of the test itself, nothing to do with the prevalence of the disease in both the population.

Now specificity means the ability of the test to identify those without the disease (true negetive rate)

As the test giving false positive results for population A,

The specificity of the test is lower in popula A.

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