In an experimental design, what is manipulated?

In an experimental design, what is manipulated?

• A. The dependent variable.
• B. The independent variable.
• C. The control variable.
• D. The measurement tool.

Answer: (B)

The factor you actively change to test its effect is the independent variable. In an experiment, researchers set up different conditions or levels of this variable and observe how the outcome changes, which helps determine if and how one factor influences another. For example, if you want to see how study time affects test scores, the amount of time spent studying is the independent variable, varied across groups (like 1 hour, 3 hours, or 5 hours). The test score would be the dependent variable, measured to see the impact. Other variables you keep the same across groups are control variables, and the measurement tool is simply the instrument used to assess the outcome.

The factor you actively change to test its effect is the independent variable. In an experiment, researchers set up different conditions or levels of this variable and observe how the outcome changes, which helps determine if and how one factor influences another. For example, if you want to see how study time affects test scores, the amount of time spent studying is the independent variable, varied across groups (like 1 hour, 3 hours, or 5 hours). The test score would be the dependent variable, measured to see the impact. Other variables you keep the same across groups are control variables, and the measurement tool is simply the instrument used to assess the outcome.