The statistic formulated by adding a group of scores together and then by dividing that sum by the total number of scores is called the

Which of the following theorists placed the greatest emphasis on unconscious experience as an important influence in development?

a. Sigmund Freud b. Erik Erikson c. Jean Piaget d. Lev Vygotsky

According to the terminology used by demographers, people between the ages of 65 and 74 years are called __________

a) old old b) young old c) geriatric d) oldest old