a) specificity of the test is lowr in
population A
b) the prevalence of the disease is lower in population A
c) the prevalence of the disease is higher in population A
d) the specificity of the test is higher in population A
b) the prevalence of the disease is lower in population A
c) the prevalence of the disease is higher in population A
d) the specificity of the test is higher in population A
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Ans: c
Sensitivity and Specificity are intrinsic
properties of a test and do
not change
with change in prevalence. Similarly “FALSE POSITIVE RATE = 1 –
Specificity” also does
not change with prevalence.
However, when the prevalence is low the
NUMBER OF FALSE POSITIVES will increase.
Thus the answer here is c – prevalence of disease is higher in
population A
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