In order to test the effectiveness of an intervention using an experiment, it is best to have a

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Randomly assigned control groups allow for comparison of the intervention group to a group that is not receiving the intervention, and random assignment helps ensure that any differences between the two groups are due to chance rather than other factors. While visible independent variables and representative control groups may also be important in certain circumstances, neither is as crucial as having a randomly assigned control group for testing intervention effectiveness through an experiment. Double-blind studies are important for minimizing bias, but they are not necessarily required for testing intervention effectiveness.

In Order to Test the Effectiveness of an Intervention Using