In experimental design, which variable is deliberately changed by the researcher to test its effect?

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Multiple Choice

In experimental design, which variable is deliberately changed by the researcher to test its effect?

Explanation:
The main idea being tested is the variable that the researcher deliberately changes to see its effect on the outcome. This variable is manipulated or varied by the experimenter to observe how it influences what is measured. For example, if you study how fertilizer amount affects plant growth, the amount of fertilizer is the independent variable, and plant growth is the dependent variable. The conditions you keep constant—like plant species, soil type, light, and water—are controlled variables, and a constant is something you keep the same rather than change. The dependent variable is what you measure in response to the change in the independent variable.

The main idea being tested is the variable that the researcher deliberately changes to see its effect on the outcome. This variable is manipulated or varied by the experimenter to observe how it influences what is measured. For example, if you study how fertilizer amount affects plant growth, the amount of fertilizer is the independent variable, and plant growth is the dependent variable. The conditions you keep constant—like plant species, soil type, light, and water—are controlled variables, and a constant is something you keep the same rather than change. The dependent variable is what you measure in response to the change in the independent variable.

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