In Crum and Langer's 2007 study examining the power of mind-set on health, how did they increase the likelihood that their results were due to their intervention and not due to some other factor?
A) they conducted a lab study, rather than a field study
B) they used a retrospective design to establish groups
C) they relied on a prospective design to establish groups
D) they used random assignment to establish groups
Correct Answer:
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