Control Variable

By Ashley Crossman
Updated on November 24, 2019
If all parts of an experiment are conducted at the same temperature, then temperature is a controlled variable.
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The Role of a Controlled Variable in an Experiment
By Anne Marie Helmenstine, Ph.D.

A control variable is a variable that is held constant in a research analysis. The use of control variables is generally done to answer four basic kinds of questions:

  1. Is an observed relationship between two variables just a statistical accident?
  2. If one variable has a causal effect on another, is this effect a direct one or is it indirect with another variable intervening?
  3. If several variables all have causal effects on the dependent variable, how does the strength of those effects vary?
  4. Does a particular relationship between two variables look the same under various conditions?
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Your Citation
Crossman, Ashley. "Control Variable." ThoughtCo, Jan. 29, 2020, thoughtco.com/variable-control-3026157. Crossman, Ashley. (2020, January 29). Control Variable. Retrieved from https://www.thoughtco.com/variable-control-3026157 Crossman, Ashley. "Control Variable." ThoughtCo. https://www.thoughtco.com/variable-control-3026157 (accessed April 19, 2024).