How has the median age of first marriage in the United States changed from 1970 to 2009?
a. It has dropped by about four years.
b. It has remained constant
c. It has risen by about five years.
d. It has risen by about eight years.
c
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Which of the following indicates the correct order of stages in Piaget's theory of cognitive development?
A) formal operational, concrete operational, preoperational, sensory motor B) preoperational, concrete operational, formal operational, sensorimotor C) preoperational, sensorimotor, formal operational, concrete operational D) sensorimotor, preoperational, concrete operational, formal operational
Mothers of securely attached infants are more likely than mothers of babies with other attachment styles to _________
A) ?feed their babies when the babies are hungry rather than on a set schedule. B) ?vary their level of responsiveness to their babies to prevent over-attachment. C) ?minimize physical contact with their babies. D) ?feed their babies on a set schedule, and not respond when babies cry for food outside of this schedule.