A Screening Test for a Newly Discovered Disease Is Being

question 6

Multiple Choice

A screening test for a newly discovered disease is being evaluated. In order to determine the effectiveness of the new test, it was administered to 900 workers. 150 of the individuals diagnosed with the disease tested positive. A negative test finding occurred in 60 people who had the disease. A total of 50 persons not diseased tested positive for it. Assume the prior probability is not known.
-What was the predictive value of a positive test?

• A) 0.75
• B) 0.71
• C) 0.88
• D) 0.93
• E) 0.91

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Definitions:

Focal Plane

The specific distance at which the lens of a camera or microscope focuses light to form a sharp image.

Depth of Field

The range of distance within a photograph that appears acceptably sharp, influenced by the aperture, focal length, and distance from the subject.

Resolution

The process of reducing or separating something into its components or the clarity and detail of an image.

Field Diameter

The apparent size of an area visible through the microscope lens, often measured in millimeters or micrometers.