An investigator wants to assess the usefulness of a certain symptom (S) in the diagnosis of a particular disease (D). In a random sample of 800 patients with the disease, 774 reported having the symptom. In an independent random sample of 1280 subjects without the disease, 17 reported having the symptom. (Hint: The symptom is the test) If the prevalence of D in the population is 0.002, what is the positive predictive index of the S? (Probability of having the disease D given that the patient had symptoms S)? What is the positive predictive value if the prevalence is 0.2?
An investigator wants to assess the usefulness of a certain symptom (S) in the diagnosis of a particular disease (D). In a random sample of 800 patients with the disease, 774 reported having the symptom. In an independent random sample of 1280 subjects without the disease, 17 reported having the symptom. (Hint: The symptom is the test) If the prevalence of D in the population is 0.002, what is the positive predictive index of the S? (Probability of having the disease D given that the patient had symptoms S)? What is the positive predictive value if the prevalence is 0.2?
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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An investigator wants to assess the usefulness of a certain symptom (S) in the diagnosis of a particular disease (D). In a random sample of 800 patients with the disease, 774 reported having the symptom. In an independent random sample of 1280 subjects without the disease, 17 reported having the symptom. (Hint: The symptom is the test)
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If the prevalence of D in the population is 0.002, what is the positive predictive index of the S? (
Probability of having the disease D given that the patient had symptoms S)? -
What is the positive predictive value if the prevalence is 0.2?
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