Which characteristic of experimental design allows for more confident cause-effect interpretation than do other designs?

Question

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Random assignment of subjects to groups is a key feature of experimental design that allows researchers to more confidently infer cause and effect relationships. This is because it helps to ensure that any differences observed between groups can be attributed to the treatment or intervention being tested, rather than to pre-existing differences between the groups.

Which Characteristic of Experimental Design Allows for More Confident Cause-Effect