Epidemiology Final Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: Which of the following best explains this difference between the positive
predictive values?
Answer:
The prevalence of virus X infection is higher among the hospital patients than among
blood donors
Q: A screening examination was performed on 250 persons for Factor X, which is
found in disease
Answer:
Y. A definitive diagnosis for disease Y among the 250 persons had been obtained
previously.
The results are charted below:
Q: The sensitivity of this test is expressed as
Answer:
80%
,Epidemiology Final Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: True or False?
Answer:
Validity is the ability of a measuring instrument to give a true measure. true
Q: Sensitivity and specificity of a screening test refer to its
Answer:
validity
Q: True or False?
Answer:
Reliability refers to the ability of a measuring instrument to give consistent results on
repeated trials, regardless of its accuracy. true
,Epidemiology Final Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: A new blood test has been developed to screen for disease Z. Researchers
establish 50 units as a cut point above which a test is considered positive and
thereby indicative of disease. The test manufacturers determine that the test's
sensitivity is unacceptably low. However, the manufacturers are not concerned
with the specificity and do not want the cost of the test to rise. How can they
improve the sensitivity of the test?
Answer:
Lower the cut point below 50 units.
Q: True or False?
Answer:
Specificity refers to the ability of a screening test to identify only nondiseased
individuals who actually do not have the disease. true
Q: True or False?
Answer:
It is possible for a measure to be valid but unreliable. false
, Epidemiology Final Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: A new screening test for Lyme disease is developed for use in the general
population. The
Answer:
sensitivity and specificity of the new test are 60% and 70%, respectively. Three
hundred people
are screened at a clinic during the first year the new test is implemented. Assume the
true
prevalence of Lyme disease among clinic attendees is 10%.
Calculate the following value
The predictive value of a positive test is: 18.2%
Q: The degree of agreement among several trained experts refers to
Answer:
D. inter-judge reliability
Latest 2026 Update
Q: Which of the following best explains this difference between the positive
predictive values?
Answer:
The prevalence of virus X infection is higher among the hospital patients than among
blood donors
Q: A screening examination was performed on 250 persons for Factor X, which is
found in disease
Answer:
Y. A definitive diagnosis for disease Y among the 250 persons had been obtained
previously.
The results are charted below:
Q: The sensitivity of this test is expressed as
Answer:
80%
,Epidemiology Final Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: True or False?
Answer:
Validity is the ability of a measuring instrument to give a true measure. true
Q: Sensitivity and specificity of a screening test refer to its
Answer:
validity
Q: True or False?
Answer:
Reliability refers to the ability of a measuring instrument to give consistent results on
repeated trials, regardless of its accuracy. true
,Epidemiology Final Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: A new blood test has been developed to screen for disease Z. Researchers
establish 50 units as a cut point above which a test is considered positive and
thereby indicative of disease. The test manufacturers determine that the test's
sensitivity is unacceptably low. However, the manufacturers are not concerned
with the specificity and do not want the cost of the test to rise. How can they
improve the sensitivity of the test?
Answer:
Lower the cut point below 50 units.
Q: True or False?
Answer:
Specificity refers to the ability of a screening test to identify only nondiseased
individuals who actually do not have the disease. true
Q: True or False?
Answer:
It is possible for a measure to be valid but unreliable. false
, Epidemiology Final Questions and Answers with Verified Solutions |
Latest 2026 Update
Q: A new screening test for Lyme disease is developed for use in the general
population. The
Answer:
sensitivity and specificity of the new test are 60% and 70%, respectively. Three
hundred people
are screened at a clinic during the first year the new test is implemented. Assume the
true
prevalence of Lyme disease among clinic attendees is 10%.
Calculate the following value
The predictive value of a positive test is: 18.2%
Q: The degree of agreement among several trained experts refers to
Answer:
D. inter-judge reliability
