![]() Sometimes you can identify a confounding variable and turn it into a control variable. This could be due to what is called a “ confounding variable.” Examples of confounding variables could be humidity, magnetism, and vibration. Sometimes you think you have controlled everything except the independent variable, but still get strange results. ![]() Would you expect the same results at 5 ☌ or 35 5 ☌? Sometimes the potential effect of a control variable can lead to a new experiment! What if you conducted your experiment at 15 ☌. If you did not report this temperature in your “methods” section, another researcher might have trouble reproducing your results. As another example, say you did control the temperature. This could lead you to incorrectly accept or reject your hypothesis. One light source might be hotter than the other, affecting plant growth. The increase confidence in the outcome of the experiment.įor example, if you conducted an experiment examining the effect of the color of light on plant growth, but you didn’t control temperature, it might affect the outcome.They make it easier to reproduce the experiment.Remember, the independent variable is the one you change, the dependent variable is the one you measure in response to this change, and the control variables are any other factors you control or hold constant so that they can’t influence the experiment. Take a look at the difference between a control variable and control group and see examples of control variables. Unlike the independent and dependent variables, control variables aren’t a part of the experiment, but they are important because they could affect the outcome. A single experiment may contain many control variables. For this reason, it’s also known as a controlled variable or a constant variable. This entry was posted on Augby Anne Helmenstine (updated on January 30, 2023)Ī control variable is any factor that is controlled or held constant in an experiment.Ī control variable is any factor that is controlled or held constant during an experiment.
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