Which of the following is a characteristic of experimental, but not descriptive, research methods?

Question

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Random assignment is a key characteristic of experimental research, where participants are randomly assigned to different groups to ensure that the groups are equivalent at the beginning of the study. Descriptive research methods, such as naturalistic observation, case studies or focus groups do not involve random assignment. The formation of a hypothesis is a characteristic shared by both experimental and descriptive research methods.

Which of the Following Is a Characteristic of Experimental, but Not