Although causality is difficult to determine, which scientific method most strongly yields evidence for cause and effect relationships?

Question

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Experimental design is the scientific method that most strongly yields evidence for cause and effect relationships because it allows researchers to manipulate an independent variable to observe its effect on a dependent variable. This method includes the use of control groups and random assignment to increase the validity of the results. Correlational studies can only identify relationships between variables, but cannot determine causality. Ex post facto designs and descriptive research are also limited in their ability to establish causality.

Although Causality Is Difficult to Determine, Which Scientific Method Most