A control or control group means that the experiment involves a group (or part) of the study that is the same in every way as the tested (experimental) group EXCEPT for the experimental treatment. This is done to use as a benchmark for comparison to see if the experimental treatment (or process or observation, etc.) has an effect different from no treatment at all. o Experiments with a control group are sometimes called “controlled experiemnts.”
Experimental group. The group (or part) of a study that receives a treatment or is manipulated in order to test whether or not an effect can be observed or measured that is different when compare to a control group. Variable: the thing being measured or manipulated in an experiment. There are two kinds of variables—independent variables and dependent variables. Dependent variable: the measured outcome of an experiment. It is the effect of the manipulated variable (also called the independent variable). This variable “depends” on the independent variable. Independent variable: the factor or thing that is manipulated by the researcher. This variable is the one that the researcher wants to test to see if there is an effect.
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