A study of the relationship between two variables that the investigator does not control is known as a

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The study described in the question, where the investigator only observes the relationship between two variables and does not control them, is a correlational study. A) random assignment refers to assigning participants to different groups in an experiment randomly, B) double-blind experiment is an experimental design where both the participants and the experimenters are unaware of the group assignments, and D) case history is a detailed analysis of an individual or group usually used in clinical settings.

A Study of the Relationship Between Two Variables That the Investigator