A researcher uses a within-subjects design in which one group completes an intense workout and a second group completes an easy workout. He finds that participants who completed the intense workout first were tired and so took longer to complete the easy workout the following day, compared to participants who did the easy workout first. What type of threat to internal validity was described in this example
A. maturation
B. sampling effects
C. participant attrition
D. participant fatigue
Ans: D
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