Question

The ________ is controlled by the experimenter. variability independent variable dependent variable confounding variable

Answer 1

The answer is confounding variable. A variable that the researcher unsuccessful to control, and which leads to the harmful of the internal validity of an experiment. Confounding variables can ruin an experiment and produce useless results. This extraneous impact is used to influence the outcome of an experimental design.

Answer 2

The independent variable is controlled by the experimenter. An independent variable is the variable you have control over, what you can choose and change. It is usually what you think will affect the dependent variable. A change in the independent variable directly causes a change in the dependent variable.