Question

multiple choice 1 point
which of the following best describes a controlled experiment?
an experiment that includes a control group and an experimental group, differing only in the independent variable.
an experiment where only the independent variable is manipulated.
an experiment conducted without any variables.
an experiment that involves manipulating multiple variables simultaneously.

Explanation:

A controlled experiment has a control group and an experimental group which only differ in the independent - variable. In such an experiment, only the independent variable is manipulated to observe its effect on the dependent variable.

Answer:

An experiment that includes a control group and an experimental group, differing only in the independent variable.