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Which situation would MOST favor an observational study? A) none of the situations B) The independent variable can be systematically varied across a wide range of values. C) The same sample subject can be tested using different values of the independent variable. D) A harmful, invasive process is required to set the independent variable in a sample subject.

Respuesta :

the answer is A) none of the situations

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It's
A. None of the situations
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