One reason random assignment is considered important in experimental research is because

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Random assignment plays a crucial role in inferring cause and effect relationships between two variables in experimental research. By randomly assigning participants to groups, researchers can ensure that any observed differences between the groups (e.g. in treatment outcomes) can be attributed to the manipulation of the independent variable and not some other extraneous factor. Thus, option C is the correct choice. Options A and B are incorrect because random assignment alone doesn't necessarily reveal which variables are correlated or ensure a representative sample; these outcomes depend on the sampling method used. Option D is partially correct (because it emphasizes the benefits of random assignment) but includes a misleading claim about sampling; random assignment doesn't help with sampling biases but rather with controlling for the effects of extraneous variables.

One Reason Random Assignment Is Considered Important in Experimental Research