Can effect results : Experimental subjects may be tired if they are in an experiment at the end of the day ; equipment breakdowns can change the results produced by an independent variable during a treatment session, differences in the way instructions are presented can alter subject’ responses.
In a well – controlled experiment, we attempt to recognize the potential for extraneous variables and use procedures to control them. Realistically, though, even the most well – controlled experiment will be influenced from time to time by extraneous variables that cannot b controlled in advance. As long as these influences are infrequent, random event, they do not necessarily invalidate an experiment. However, random influences from extraneous errors into the scores obtained from subjects, so it is important to control them as carefully as possible these influences will obscure the effects we are really interested in and make it more difficult to detect significan treatment effects.
Can effect results : Experimental subjects may be tired if they are in an experiment at the end of the day ; equipment breakdowns can change the results produced by an independent variable during a treatment session, differences in the way instructions are presented can alter subject’ responses. In a well – controlled experiment, we attempt to recognize the potential for extraneous variables and use procedures to control them. Realistically, though, even the most well – controlled experiment will be influenced from time to time by extraneous variables that cannot b controlled in advance. As long as these influences are infrequent, random event, they do not necessarily invalidate an experiment. However, random influences from extraneous errors into the scores obtained from subjects, so it is important to control them as carefully as possible these influences will obscure the effects we are really interested in and make it more difficult to detect significan treatment effects.
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