Which term denotes the variable that is manipulated in an experiment?

Which term denotes the variable that is manipulated in an experiment?

• A. Environment
• B. Independent Variable
• C. Positive Reinforcer
• D. Establishing Operation

Answer: (B)

The variable that the researcher changes on purpose is the independent variable. It’s the factor you manipulate to see if it causes a change in another variable, typically what you measure—the dependent variable. In an experiment, you set the independent variable at different levels (for example, different amounts of reinforcement or different antecedent conditions) and observe how the dependent variable responds. The environment is the overall setting and context, not the specific manipulated factor in this sense. A positive reinforcer is a consequence that increases behavior, not the variable you deliberately vary. An establishing operation is a momentary state that alters the value of reinforcement, changing motivation, but it’s not the variable you systematically manipulate across conditions. For example, changing how long reinforcement is provided serves as the independent variable, while the change in behavior rate is the dependent variable.

The variable that the researcher changes on purpose is the independent variable. It’s the factor you manipulate to see if it causes a change in another variable, typically what you measure—the dependent variable. In an experiment, you set the independent variable at different levels (for example, different amounts of reinforcement or different antecedent conditions) and observe how the dependent variable responds. The environment is the overall setting and context, not the specific manipulated factor in this sense. A positive reinforcer is a consequence that increases behavior, not the variable you deliberately vary. An establishing operation is a momentary state that alters the value of reinforcement, changing motivation, but it’s not the variable you systematically manipulate across conditions. For example, changing how long reinforcement is provided serves as the independent variable, while the change in behavior rate is the dependent variable.