Which of the following best describes a controlled experiment?
A) An experiment repeated many times to ensure that the results are accurate
B) An experiment includes at least two groups, one of which does not receive the experimental treatment
C) An experiment that includes at least two groups, one differing from the other by two or more variables
D) An experiment that includes one group for which the scientist controls all variables

Question

Quizplus · Accepted Answer

A controlled experiment typically includes at least two groups: the experimental group, which receives the treatment or variable being tested, and the control group, which does not receive the treatment. This setup allows researchers to compare outcomes and determine the effect of the treatment.

Which of the Following Best Describes a Controlled Experiment