A controlled experiment is one that a. proceeds slowly...

A controlled experiment is one that
a. proceeds slowly enough that a scientist can make careful records of the results.
b. tests experimental and control groups in parallel.
c. is repeated many times to make sure the results are accurate.
d. keeps all variables constant.

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Key Concepts

Controlled Experiment

A controlled experiment is a scientific investigation where only one variable is intentionally changed at a time while all other relevant factors are kept constant. This helps researchers establish a cause-and-effect relationship between the variable being manipulated and the observed outcomes.

Control Group and Experimental Group

In controlled experiments, subjects are typically divided into two groups: the experimental group, which is exposed to the variable being tested, and the control group, which is not. This parallel testing ensures that differences in outcomes can be attributed to the effect of the variable under investigation.

Variable Control

Controlling variables is the process of keeping all potential intermediary factors constant except for the one under study. This practice is critical to ensure that the only difference between groups is the variable being tested, thereby strengthening the validity of the conclusions drawn from the experiment.

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