the variable which an experimenter deliberately manipulates in order to observe its relationship with some other quantity, or which defines the distinct conditions in an experiment
constant variable
A variable whose value cannot be changed once it has been assigned a value.
experimental group
A group of subjects that are exposed to the variable of a control experiment.
control group
A group used as a standard of comparison in a control experiment.
dependent variable
he variable measured by the experimenter. It is controlled by the value of the independent variable
