A not-so-brilliant chemist is convinced that he has a drug that will make people smarter. To test his hypothesis he gives participants an IQ test before taking the drug and the same IQ test after taking the drug. Participants performed better on the second IQ test. Assuming the drug did not work, what might account for the improved IQ test performance?
A) Instrumentation effects
B) Participant mortality
C) Quasi effects
D) Testing effects
Correct Answer:
Verified
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