Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 16 Nov 2017 My Price 5.00

Western blot blood test

HIV testing For a combined ELISA–Western blot blood test for HIV positive status, the sensitivity is about 0.999 and the specificity is about 0.9999 (Gigerenzer 2002, pp. 124 , 126 ).

a. Consider a high-risk group in which 10% are truly HIV positive. Construct a tree diagram to summarize this diagnostic test.

b. Display the intersection probabilities from part a in a contingency table.

c. A person from this high-risk group has a positive test result. Using the tree diagram or the contingency table, find the probability that this person is truly HIV positive.

d. Explain why a positive test result is more likely to be in error when the prevalence is lower. Use tree diagrams or contingency tables with frequencies for 10,000 people with 10% and 1% prevalence rates to illustrate your arguments.

Answers

Maurice Tutor
(5)
Status NEW Posted 16 Nov 2017 09:11 PM My Price 5.00

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