What procedure can a researcher use to make sure that the various participant groups are kept roughly equivalent before exposure to an independent variable?
a. Snowball sampling
b. Double-blind assignment
c. Random assignment
d. Single-blind sampling
Answer: C
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Which of the following statements correctly describes the rate of PTSD among combat-exposed military personnel since 2001?
a) PTSD has remained stable since 2001, since there have been no new combat experiences for soldiers since 2001. b) Since PTSD is more fully understood, PTSD has declined in soldiers due to better medications. c) The rate of PTSD has tripled since 2001. d) PTSD has increased in combat-exposed women but not in combat-exposed men since 2001.
Projected average life expectancies for all individuals born in the United States in 2007
a. decreased slightly for white and black females b. showed an expansion of the racial differential between the white and black populations c. reached a record high for white and black males d. all of these e. none of these
Newborns may have a primitive awareness of self and others.
Answer the following statement true (T) or false (F)
Which of the following situations best exemplifies the concept of animistic thinking?
A. A child believes that lampposts are running along with him when he is travelling in a car. B. A child realizes that all objects that look similar in color weigh the same. C. A child believes that objects that are once hidden under a blanket will never come back again. D. A child realizes that his glass of water has more water than similar glasses of other people.