Social Studies, 11.03.2020 00:00 somedudeontheIn

Dr. Johannsen wants to test whether recovering alcoholics perform worse on tests of motor coordination than a group of control participants. Unbeknownst to him, the control group meets at an amusement park three hours before testing and goes on as many rides as possible. They perform worse than the alcoholic group. This is an example of a(n) Group of answer choices regression effect. selection-maturation effect. regression artifact. selection-history effect.

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