Which of the following statements describes a controlled experiment?
A)an experiment that is repeated many times to ensure that the results are accurate
B)an experiment that proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data
C)an experiment with at least two groups,one of which does not receive the experimental treatment
D)an experiment with at least two groups,one differing from the other by two or more variables

Question

Quizplus · Accepted Answer

A controlled experiment is an experiment in which there are at least two groups, one of which acts as a control and does not receive the experimental treatment. This allows the scientist to compare the results of the experimental group to the control group and determine if the treatment had an effect. Choices A and B do not describe a controlled experiment, and choice D adds an unnecessary complication (varying two or more variables) that is not always necessary for a controlled experiment.

Which of the Following Statements Describes a Controlled Experiment