Random sampling occurs when
a. the sample is selected from a single population
b. a random choice determines the first subject to be selected
c. the sample is selected from an infinite population
d. all members of the population have an equal chance of being selected
d
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To study childhood and adolescent thought, Piaget
A) used psychoanalysis. B) conducted open-ended clinical interviews. C) observed young people from diverse cultures. D) relied on classical and operant conditioning.
Keith's father is carrying him on his shoulders when a stranger approaches and tries to take him. Keith seems happy with the stranger as he is smiling, cooing, and babbling all the while. Keith is probably
A) over 12 months old. B) 9 to 12 months old. C) 6 to 9 months old. D) 1 to 6 months old.