Which is NOT a hallmark of a true experiment?

Name: Which is NOT a hallmark of a true experiment?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Having control over responses on the dependent measure is not a hallmark of a true experiment. In fact, it is often difficult, if not impossible, to control participants' responses completely. The other three options (manipulation of an independent variable, control over extraneous variables, and random assignment of participants) are all essential components of a true experiment.

Which Is NOT a Hallmark of a True Experiment