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Sagot :
Final answer:
Observational studies involve collecting data without manipulating variables.
Explanation:
Observational studies, also known as observational experiments, involve collecting data from a population of individuals without applying any treatments. In these studies, researchers measure characteristics in a sample but do not manipulate or control variables of interest. An example of such a study would be the comparison of groundwater nitrate concentrations among several Iowa counties.
Learn more about Observational Studies here:
https://brainly.com/question/37932836
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