Ways to Control Extraneous Variables

Waysto Control Extraneous Variables

Waysto Control Extraneous Variables

Avariable is defined to be any factor, condition, or trait, whichexists in different types or amounts. Any variable that is notintentionally studied is referred to an extraneous variable, whichaims at threatening a researcher’s internal validity (Wallen &ampFraenkel, 2000). Where a research draws on a quantitative design,more so the experimental designs, researchers often attempt tocontrol it so that they do not turn out to be confounding variables.Researchers therefore, often try to control these extraneousvariables in a number of ways.

First,the researcher needs to identify specific variables that are morelikely to influence dependent variables. To do this, the researcheris required use his or her common sense, past experience, and logicalreasoning. According to Sapp (2009), it is obvious a noisy room cancause a distraction as opposed to a silent room. The researcher’suse of a silent room means that stopping an extraneous variablenoise, from turning into a confounding variable. Secondly, once anextraneous variable has been identified, it can be controlled throughmatching values or holing the variable constant across treatmentcondition (Sapp, 2009). This is done by establishing a standardizedcondition, procedure, or environment to ensure all variables are heldconstant in the same condition.

Finally,values across treatment conditions should be matched in order toavoid the variables varying across different treatment conditions.For example, participants are often assigned in order to ensure theaverage age turn out the same for all the differing treatmentconditions (Wallen &amp Fraenkel, 2000). Failure to controlextraneous variables would turn into confounding variables, whichmeans a conclusion arrived at in an experiment is not correct, thusis important for the researchers to control the extraneous variables.

Sapp,M. (2009). Testanxiety: Applied research, assessment, and treatment interventions.Lanham: University Press of America.

Wallen,N. E., &amp Fraenkel, J. R. (2000). Educationalresearch: A guide to the process.Mahwah, N.J: Lawrence Erlbaum Associates.