Variable

Definition

A variable is a factor or condition that can change in an experiment. It is essential for testing hypotheses and observing biological phenomena under different conditions.

5 Must Know Facts For Your Next Test

1. Variables are categorized into independent, dependent, and controlled variables.
2. The independent variable is the one that the researcher manipulates to observe its effect.
3. The dependent variable is the one that is measured and observed during the experiment.
4. Controlled variables are kept constant to ensure that any changes in the dependent variable are due to the manipulation of the independent variable.
5. Understanding how to properly control variables is crucial for ensuring experimental validity.

Review Questions

• What are the three main types of variables in an experiment?
• Why is it important to control variables in a scientific experiment?
• How do you distinguish between an independent and a dependent variable?

Related terms

Hypothesis: A testable statement predicting a relationship between variables.

Control Group: A group in an experiment that does not receive the experimental treatment, used as a benchmark.

Experimental Group: The group in an experiment that receives the treatment or manipulation of interest.