A treatment variable represents a variable whose effect can be estimated with minimum variance.

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A treatment variable is a variable that is manipulated or controlled by the researcher in order to observe its effect on the response variable. By carefully selecting and controlling the levels of the treatment variable, the researcher can ensure that the estimated effect of the treatment on the response variable has minimum variance or variability. This is an important goal in experimental design, as it helps to increase the accuracy and reliability of the results obtained.

A Treatment Variable Represents a Variable Whose Effect Can Be