Given a test for a virus with sensitivity = 0.94 and specificity = 0.98 is administered to a population where 25% actually has the virus. ) Determine the probability of: i) a false positive (positive test, but no virus) ii) a false negative (has the virus, but negative test) iii) a correct diagnosis (either virus and positive or no virus and negative) ) Determine the PPV (positive predictive value) for the test.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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### Problem on Virus Testing

Given a test for a virus with sensitivity = 0.94 and specificity = 0.98 is administered to a population where 25% actually has the virus.

#### a) Determine the probability of:

i) **A false positive** (positive test, but no virus)

ii) **A false negative** (has the virus, but negative test)

iii) **A correct diagnosis** (either virus and positive or no virus and negative)

#### b) Determine the PPV (positive predictive value) for the test.
Transcribed Image Text:### Problem on Virus Testing Given a test for a virus with sensitivity = 0.94 and specificity = 0.98 is administered to a population where 25% actually has the virus. #### a) Determine the probability of: i) **A false positive** (positive test, but no virus) ii) **A false negative** (has the virus, but negative test) iii) **A correct diagnosis** (either virus and positive or no virus and negative) #### b) Determine the PPV (positive predictive value) for the test.
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