Answered: P( + result given condition is present)…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

Diagnostic tests of medical conditions can have several types of results. The test result can be either positive (+) or negative (-). A positive test result does not prove that the patient has the condition, additional medical tests may be required. Consider a random sample of 200 patients.

	Condition Present	Condition Absent	Row Total
Test Result +	110	20	130
Test Result -	20	50	70
Column Total	130	70	200

Assume the sample is representative of the entire population. For a person selected at random, compute the following probabilities:

P( + result given condition is present) [This is called the sensitivity of the test]
P( - result given condition is present) [This is known as a false-negative]
P( - result given condition is absent) [This is known as the specificity of a test]
P( + result given condition is absent) [This is known as a false-positive]
P( condition present AND positive result)

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