What is the major problem associated with self-selection as a way to assign participants to the experimental and control groups?
A) The treatment necessarily will work in the experimental group because those participants are especially motivated.
B) The two groups probably will differ on many variables besides whether or not they received the treatment.
C) Self-selection violates the requirement for informed consent.
D) Self-selection prevents the manipulation of the independent variable and measurement of the dependent variable.
B) The two groups probably will differ on many variables besides whether or not they received the treatment.
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Jennifer and Marta are 7-year-old twin sisters. When their mother tells them—angrily and for the third time—to clean up their playroom
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