In an experiment, which variable is deliberately changed to observe its effect?

In an experiment, which variable is deliberately changed to observe its effect?

• A. The variable kept constant to control bias
• B. The variable measured to assess the outcome
• C. The variable deliberately changed to observe its effect
• D. The variable that is randomly assigned

Answer: (C)

The main idea is recognizing the variable that a researcher deliberately changes to see its effect. This is the independent variable. By manipulating this factor and watching how the outcome changes, you can explore cause-and-effect relationships. Other factors are kept constant to prevent them from influencing the result, which helps isolate the impact of the independent variable. The variable you measure to assess the outcome is the dependent variable, the result you record. Randomly assigning participants or conditions helps ensure groups are comparable and reduces bias, but that assignment is not the factor you’re directly changing to observe an effect.

The main idea is recognizing the variable that a researcher deliberately changes to see its effect. This is the independent variable. By manipulating this factor and watching how the outcome changes, you can explore cause-and-effect relationships.

Other factors are kept constant to prevent them from influencing the result, which helps isolate the impact of the independent variable. The variable you measure to assess the outcome is the dependent variable, the result you record. Randomly assigning participants or conditions helps ensure groups are comparable and reduces bias, but that assignment is not the factor you’re directly changing to observe an effect.