Your Screening Test for Yellow Fever Had a Sensitivity of 88

question 11

Multiple Choice

Your screening test for yellow fever had a sensitivity of 88%, a specificity of 74% and a positive predictive value of 82% last year. This year there is an outbreak of yellow fever in the region increasing prevalence rates. You would expect the positive predictive value of the screen to:

• A) Be higher than 82% this year
• B) To remain at about 82% this year
• C) To be below 82% this year
• D) Unable to determine without the prevalence rate

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Definitions:

IRR

Internal Rate of Return, the discount rate that makes the net present value (NPV) of all cash flows from a particular project equal to zero.

Mutually Exclusive

Situations or choices where the acceptance or selection of one necessarily excludes the other(s).

Value Foregone

The benefit given up by choosing one investment or action over another alternative; essentially the opportunity cost of a decision.

IRR

The Internal Rate of Return is a financial measure utilized to calculate the expected profit of prospective investments.