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Understanding Variables in Scientific Experiments

Learn about independent, dependent, and controlled variables in experiments, crucial for accurate observations and analysis. Explore examples and their roles in testing hypotheses effectively.

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Understanding Variables in Scientific Experiments

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  1. Variables

  2. Independent variable • The independent variable is the one that is changed by the scientist. • What you can change.

  3. Dependent Variable • The scientist focuses his or her observations on the dependent variable to see how it responds to the change made to the independent variable. • This is what you observe that changes.

  4. Controlled Variable • Experiments also have controlled variables. Controlled variables are quantities that a scientist wants to remain constant, and he must observe them as carefully as the dependent variables. • This is what you keep the same in order to have a fair and accurate test.

  5. Examples: • Question Is a classroom noisier when the teacher leaves the room? • Independent Variable (What I change) • Teacher location: The teacher is either in the room or not in the room. • Dependent Variables (What I observe) • Loudness measured in decibels • Controlled Variables (What I keep the same) • Same classroom • Same students • Same time of day

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