Multiple Choice
A researcher believes that therapy is more effective if patients exercise. The researcher tells the patients that it has been arranged for them to use the hospital gym, if they so desire-and that if they are interested, they will then be in the experimental group. This represents which threat to internal validity?
A) Maturation
B) Attrition
C) History
D) Selection
Correct Answer:
Verified
Correct Answer:
Verified
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