A control group is essential for experiments to compare results accurately. The comparison group is important in quasi-experimental designs, while the static group design involves an experimental and comparison group.
Control group: a comparison group that is equivalent to the experimental group but is not given the independent variable.
Comparison group: a group in quasi-experimental designs that does not receive the experimental treatment; it is similar to a control group except assignment to the comparison group is not determined by random assignment.
Static group design: uses an experimental group and a comparison group, without random assignment and pretesting.
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