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A researcher distributes a survey concerning smoking and heart disease to 1000 randomly chosen par'dcipants. She will analyze the results to try to establish a

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A researcher distributes a survey concerning smoking and heart disease to 1000 randomly chosen par'dcipants. She will analyze the results to try to establish a link between smoking and heart disease. What type of study is this? 0 sample survey 0 observational study 0 experiment

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