The __________ variable is what the experimenter manipulates (or varies)
A) control
B) dependent
C) operational
D) independent
Answer: D
Rationale: In an experiment, the independent variable is the variable that the experimenter manipulates to distinguish between the different groups. This is in contrast with the dependent variable, which is the variable which is the observation or measurement that is recorded during the experiment and subsequently compared across all groups. The goal of an experiment is to determine if manipulating the independent variable affects the dependent variable.
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