Answered: 13) Suppose that your company has just… | bartleby

MATLAB: An Introduction with Applications

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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13) Suppose that your company has just developed a new screening test for a disease, and you are in
charge of testing its validity. You decide to evaluate the test on 1200 individuals and compare the
results of the new test to the gold standard. You know the prevalence of disease in your population is
20%. The screening test gave a positive result for 228 individuals. 220 of these individuals actually
had the disease according to the gold standard
13a) Fill in all cells of the 2 x 2 table
Results of
Test
Screening
Positive
Negative
Total
Gold Standard Determination of Disease
Positive
Negative
Total
13b) Calculate the sensitivity, specificity, and positive predictive value of the new screening test
13c) If this test were administered in a population with a disease prevalence of 1% instead of 20%
(note that the sensitivity and specificity of the test remain unchanged), how would this influence the
positive predictive value?

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