1. A study is said to have internal validity when:A. there have been proper selection of study groupsB. a lack of error in measurement.C. There is ability to generalize beyond a set of observations to some universal statement.D. A and B2. A test that determines whether disease is actually present is a: A. screening testB. diagnostic testC. reliability testD. none of the above3. Sensitivity refers to the ability of a screening test to correctly identify all screened individuals who have a disease.A. TrueB. False4. The ability of a measuring instrument to give consistent results on repeated trials refers to:A. AccuracyB. ReliabilityC. SensitivityD. SpecificityUse the information below to answer questions 5 to 10New testGold standard++809835. Calculate the sensitivity of the test:6. Calculate the specificity of the test:7. What is the positive predictive value?8. What is the negative predictive value?9. What is the accuracy of the screening test?10. What is the prevalence?Reference book: R. Frriis, Epidemiology for Public Health Practice (2009)
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