In randomized controlled trials, researchers assign participants to treatment or control groups randomly. What is the best definition of "random" as it applies to this?
A) ?Group assignment is haphazard and not systematic.
B) ?Participants are unaware of their group assignment.
C) ?Researchers are unaware of the group assignments
D) ?Everyone has an equal chance in group assignment.
D
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According to Charles Darwin, which of the following statements is true of facial expressions of emotions?
a) Humans from different cultures express emotions in their faces differently. b) Facial expressions of nonhuman primates differ from those of humans. c) Facial expressions have communicative value, not adaptive value. d) Facial expressions of emotion are biologically innate.
How do postpartum blues and postpartum depression differ?
a. They are the same. c. They involve entirely different symptoms. b. The blues are more severe. d. Postpartum depression is more severe.
According to learning theorists, aggressive behavior is
a) both modeled and rewarded in society. b) modeled, but not rewarded in society. c) not modeled, but is rewarded in society. d) neither modeled, nor rewarded in society.
Preeclampsia can be fatal to pregnant women who:
A. are not exposed to teratogens during critical periods. B. possess Rh-positive antibodies. C. do not receive any prenatal care. D. had low blood pressure during their second or third trimester.