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Identify the following as an experiment or an observational study Veterinary scientists wanted to evaluate...

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Identify the following as an experiment or an observational study Veterinary scientists wanted to evaluate whether pigs with outdoor access on farms were commonly exposed to the bacteria Brucella suis They randomly selected 24 farms in New York State Participating farms were provided a questionnaire to complete and up to 30 pigs per farm were tested for serum anti Brucella antibodies Observational Study Experiment

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