Mathematics, 17.10.2019 02:30, Kitty10101

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.

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Which situation would most favor an observational study? a) none of the situations b) the independe...