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Any part of the experiment that can change. 1.Independent variable- Part of the experiment that is changed by the scientist. (manipulated variable) 2.Dependent variable- Part of the experiment that is affected by the independent variable. (responding variable) Defining variables operationally lets other scientists know what the dependent variable is and how it is measured. There are many different ways to define variables operationally. It is up to the scientist to decide how the variables will be measured. Definitions must be clear in order for the experiment to be repeated. The method chosen for measurement should produce the best data set for what is being measured. |