Question

Given the international response to the Ebola crisis and the time course of the disease, the...

Given the international response to the Ebola crisis and the time course of the disease, the prevalence of Ebola gradually falls from the high of about 35% of hospitalized Ebola patients to only 5%. Which ONE of the following statements about the effect of this fall in prevalence is true? (1 point).

a. The change in prevalence will reduce the predictive value of a positive result
b. The specificity of the test is likely to decline
c. The predictive value of a negative result will decline
d. The specificity of the test will increase at the expense of its sensitivity
e.   None of the above

Math   Statistics-And-Probability   
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Answer #1

Reason : Prevalence have impacts on the positive prescient worth (PPV) and negative prescient worth (NPV) of tests. As the commonness expands, the PPV additionally increments however the NPV diminishes. So also, as the pervasiveness diminishes the PPV diminishes while the NPV increments.

Affectability and particularity reliant on the pervasiveness of the sickness. Higher the affectability, lower will be the explicitness and bad habit versa.Specifity give genuine positive and genuine negative test outcome. On the off chance that predominance falls, negative prescient worth is expanded specifity is expanded giving genuine outcomes.

Ans : Option a and d

a) The change in prevalence will reduce the predictive value of a positive result.

d) The specificity of the test will increase at the expense of its sensitivity.

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