Butler expanded on Erikson's ideas by proposing that in old age, all of us go through a process in which there is a "progressive return to consciousness of past experience, and particularly, the resurgence of unresolved conflicts." Butler is describing:

Estimate the population mean within a confidence interval of .95

What will be an ideal response?

If a ball that a five-month-old infant is playing with rolls under a chair (and out of sight), the infant will not look for it. Piaget believed that this occurs because the infant

a. does not understand the concept of roll. b. has a short attention span. c. has not developed conservation. d. has not developed object permanence.