Please see in the copied section of the article where a citation needed. Here one could use Royse, D. (2011). Research methods in social work, sixth edition. Belmont, CA: Brooks/Cole/Cengage. ISBN 0840032277; page 109 to support the statement. wanker
Controlled variables are also important to identify in experiments. They are the variables that are kept constant to prevent their influence on the effect of the independent variable on the dependent. Every experiment has a controlling variable, and it is necessary to not change it, or the results of the experiment won't be valid. --moved from top-- contrib by 18.104.22.168 on 20:42, 22 July 2010
Semi-protected edit request on 15 April 2015
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A independent variable is wrong. should be an independent 22.214.171.124 (talk) 14:37, 15 April 2015 (UTC)
Done, thanks! --ElHef (Meep?) 14:43, 15 April 2015 (UTC)