Researchers often use control variables in their experiments to ensure accurate results.

There are many confounding variables that can affect the results of the study.

Researchers need to control for extraneous variables in order to obtain accurate results.

The researcher changed the manipulated variables in the experiment.

The researcher analyzed the data and identified several outcome variables.

The researcher analyzed the relationship between the predictor variables and the outcome variable.

The truth values of the propositional variables are important in logic.

I need to declare multiple reference variables in my program.

The experiment measured multiple responding variables.

The schematic variables in the circuit diagram represent different electrical components.