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Exam 11: Randomized Trials: Some Further Issues

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Exam 1: Introduction4 Questionsadd course
Exam 2: The Dynamics of Disease Transmission11 Questionsadd course
Exam 3: The Occurrence of Disease: Idisease Surveillance and Measures of Morbidity7 Questionsadd course
Exam 4: The Occurrence of Disease: II. Mortality and Other Measures of Disease Impact12 Questionsadd course
Exam 5: Assessing the Validity and Reliability of Diagnostic and Screening Tests14 Questionsadd course
Exam 6: The Natural History of Disease: Ways of Expressing Prognosis7 Questionsadd course
Exam 7: Observational Studies12 Questionsadd course
Exam 8: Cohort Studies7 Questionsadd course
Exam 10: Assessing Preventive and Therapeutic Measures: Randomized Trials4 Questionsadd course
Exam 11: Randomized Trials: Some Further Issues2 Questionsadd course
Exam 12: Estimating Risk: Is There an Association12 Questionsadd course
Exam 13: More on Risk: Estimating the Potential for Prevention9 Questionsadd course
Exam 14: From Association to Causation: Deriving Inferences From Epidemiologic Studies6 Questionsadd course
Exam 15: More on Causal Inference: Bias, Confounding, and Interaction10 Questionsadd course
Exam 16: Identifying the Roles of Genetic and Environmental Factors in Disease Causation6 Questionsadd course
Exam 17: Using Epidemiology to Evaluate Health Services7 Questionsadd course
Exam 18: Epidemiologic Approach to Evaluating Screening Programs12 Questionsadd course
Exam 19: Epidemiology and Public Policy4 Questionsadd course
Exam 20: Ethical and Professional Issues in Epidemiology4 Questionsadd course
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Epidemiologists decided to investigate the effect of sunscreens on sunburns.They ran an epidemiologic study to see the association of sunscreens and sunburns.Overall,460 people have enrolled in the study.Investigators randomly allocated 230 people to the treatment group (sunscreens) and 230 to the control group (placebo).They exposed those 460 people to the high mountain trail on a sunny day.At the end of the study,30 people developed sunburns in the sunscreen group and 130 people developed sunburns in the placebo group.What type of study design is this?

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What is the primary purpose of randomization?

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