Mathematics, 17.02.2022 06:30, apolloplays10

An epidemiologist wishes to study the factors which might contribute to heart disease. They ask doctors to provide biometric data on patients recently diagnosed with heart disease as well as data on patients who have not been diagnosed with heart disease. Is this an example of an observational study or an experiment? What are some possible sources of error? State at least two.

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An epidemiologist wishes to study the factors which might contribute to heart disease. They ask doct...