Question

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

Explanation:

A controlled experiment typically has a control group and an experimental group, where only the independent variable differs between them. Let's analyze each option:

• Option 1: A controlled experiment manipulates the independent variable, but it's not the only key feature.
• Option 2: Manipulating multiple variables simultaneously is not a controlled experiment (controlled experiments aim to isolate one variable).
• Option 3: This matches the definition of a controlled experiment, as it has a control and experimental group differing only in the independent variable.
• Option 4: An experiment must have variables (independent and dependent) to be a controlled experiment.

Answer:

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