![]() ![]() In this case, you would match the groups in terms of previous history of cavities, diet and dental hygiene habits including how and how often they brush their teeth. Extraneous variables are found by surveying previous research in the area. You would find two groups, trying to control the extraneous variables. This controls for experimenter bias and self-fulfilling prophecy, which means that experimenters with particular expectations are likely to consciously or unconsciously to bias the experiment and influence it to conform to their expectations.Īs an example, suppose you want to find out if fluorides reduce dental cavities. Distribution of the independent variable and placebo are controlled by third party. Double blind keeps both subjects and experimenter ignorant of group setup. Subjects don't know if they are in experimental or control group to reduce placebo effect, a change in behavior solely due to believing that you are getting the independent variable.Ģ. Single blind gives the control group a placebo - a substance that is inert, it has no physical effect. Extraneous variables are balanced between experimental and control groups.ġ. The control group is similar to experimental, except it does not receive the independent variable. The experimental group receives the independent variable. If possible, you try to keep them constant between the experimental and control group. Here is a summary:Īn independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable.Ī dependent variable is the response or measure of results.Įxtraneous variables - other than the independent variable - potentially can affect the dependent variable, so they must be controlled. You might want to review aspects of the experimental method. Of course, you will need a control group. Hypothesis example: Younger hamsters will run a maze faster. ![]() What independent variable(s) are you testing to see how they effect hamster speed? Age? Gender? Health? Getting an electric shock? Being hungry? ![]()
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