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I design an experiment to determine how, if at all, ambient music impacts if strangers talk to each other in waiting rooms. To do this, I invite participants for an experiment on another topic. When the participants come to my laboratory, I have them sit in waiting areas with different styles of music playing, and then record if and when respondents talk to one another. Whether or not participants talk to each other is my dependent variable. Based on this description, the operational definition of my dependent variable is derived from what kind of empirical indicator?

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