When two comparison groups within an experiment are identical except for one variable, the experiment is called a controlled experiment.
A controlled experiment is one in which all of the variables are the same or constant except for one.
In this type of experiment, a collection of data for a control group is considered, and one or more other groups are investigated. Except for one variable, all circumstances are similar to the control group and each other.
A controlled experiment might look like this:
What effect does soil type have on seed germination time?
A controlled experiment is put up to answer this question.
Four identical pots were used for the experiment, each filled with a different type of soil. Bean seeds were sown in each pot, the pots were placed in a sunny window, watered, and the time it took for the seeds to germinate was recorded.
Learn more about a controlled experiment,
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