Multiple Choice
To study the effects of aging,Professor Drake compares the reaction times of 60-year-olds with those of 30-year-olds.She tests all younger subjects in the morning,and all older subjects in the afternoon.She concludes that aging causes a decline in the speed of responses.This study lacks ________ because of potential ________.
A) external validity; demand characteristics
B) external validity; confounds
C) internal validity; demand characteristics
D) internal validity; confounds
Correct Answer:
Verified
Correct Answer:
Verified
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