Mark is a participant in a human intervention study that is testing the impact of selenium supplements on the performance of endurance athletes. Though Mark does not know if he is receiving selenium or an inactive sugar pill, he is sure that it is the tablet that he is taking that has helped him shave several minutes off his usual marathon time. What effect is Mark experiencing?
a. Thornburg
b. Placebo
c. Predisposition
d. Hawthorne
Question 2
Mia is a participant in a human intervention study designed to test the effectiveness of losing weight by eating a diet that contains 25 of one's required kcalories from fat. Because she is in this study, Mia has decided to increase the amount of exercise she gets and to reduce the amount of beer she drinks. Mia's behavior is an example of _____.
a. the Sanders effect
b. subject bias
c. a confounding variable
d. the Hawthorne effect
Anterior view of the human skeleton.
20 weeks old human fetus
Skeletons of a human and an elephant
Testing the Chemical Characteristics of Urine with Reagent Strips
Sperry’s classic study of eye rotation and regeneration.
The human brain