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Sagot :
Final answer:
Observational studies involve measuring characteristics in a sample without researcher influence.
Explanation:
Observational studies are a type of nonexperimental scientific investigation where researchers measure characteristics in a sample without manipulating variables. In this type of study, the population is not influenced by researchers. For example, a political poll collecting data from adults without manipulating their opinions is an observational study.
Learn more about Observational Studies here:
https://brainly.com/question/37932836
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