- Controlled experiments
- Experimental Design
- Get the Experimental Design worksheet IV, DV, controls, and control groups template
Experimental Design worksheet IV, DV, controls, and control groups that should be controlled or held constant, and 4) any control group(s) in the experiment.and watch
In this section, we look at some different ways to design an experiment. The primary distinction we will make is between approaches in which each participant experiences one level of the independent variable and approaches in which each participant experiences all levels of the independent variable. The former are called between-subjects experiments and the latter are called within-subjects experiments. Or a researcher with a sample of 60 people with severe agoraphobia fear of open spaces might assign 20 of them to receive each of three different treatments for that disorder. It is essential in a between-subjects experiment that the researcher assign participants to conditions so that the different groups are, on average, highly similar to each other. Those in a trauma condition and a neutral condition, for example, should include a similar proportion of men and women, and they should have similar average intelligence quotients IQs , similar average levels of motivation, similar average numbers of health problems, and so on. This matching is a matter of controlling these extraneous participant variables across conditions so that they do not become confounding variables.
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Get the Experimental Design worksheet IV, DV, controls, and control groups template
In an experiment , data from an experimental group is compared with data from a control group. These two groups should be identical in every respect except one: The difference between a control group and an experimental group is that the independent variable is changed for the experimental group, but is held constant in the control group. An experimental group is the group that receives an experimental procedure or a test sample. This group is exposed to changes in the independent variable being tested. The values of the independent variable and the result on the dependent variable are recorded. An experiment may include multiple experimental groups at one time. A control group is a group separated from the rest of the experiment such that the independent variable being tested cannot influence the results.