All participants have the same value of a , participants' different characteristics or behaviors lead them to have different values of , while differential treatment of participants leads to their having different values of .

The correct answer is constant, measured variable, manipulated variable

Constant refers to the quantity that does not have a fixed value in a given calculation, mathematical process or equation. This means that the constant has a value that does not change within a specific context.

Measured Variable can be understood as any quantity, quality, magnitude of a characteristic that can have several numerical values. Variable can be understood as a classification or a measure; an amount that changes in each case or unit of study.

Manipulated Variable is the quantity or condition modified by the controller, so that it affects the value of the controlled variable. Usually, the controlled variable is the system output.

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