Observational studies suffer the same ethical and feasibility issues as experimental studies.
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Q40: Crude rates are summary measures of disease
Q41: Although U.S. birth and death data pertain
Q42: The primary purpose of the census is
Q43: Mortality data are adequate for examining nonfatal
Q44: Race and ethnicity have a profound influence
Q46: Ecological studies can be done quickly and
Q47: Trials that prevent or delay the onset
Q48: When trials involve procedures rather than pills,
Q49: Retrospective cohort studies are considered less vulnerable
Q50: Masking guarantees comparable follow-up efforts and outcome
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