Final answer:
In experimental design, the key is to isolate the independent variable's effect by exposing it only to the experimental group, allowing for comparison with the control group.
Explanation:
In ideal experimental design, the only difference between the experimental and control groups is whether participants are exposed to the experimental manipulation. Each group goes through all phases of the experiment, but each group will experience a different level of the independent variable: the experimental group is exposed to the experimental manipulation, and the control group is not exposed to the experimental manipulation. The researcher then measures the changes that are produced in the dependent variable in each group.
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