What do some theorists call the stage of cognitive development that follows formal operations?

Concerning her academic studies, Marta exhibits a strong desire to understand and to excel. She also perseveres when her studies get difficult. Marta is exhibiting

a. creativity. b. precociousness. c. giftedness. d. intellectual determination.

The heritability coefficient of extraversion is approximately .5, which means that:

A) a child psychologist can predict with 50% accuracy a client's extraversion level if she knows the extraversion levels of the child's parents. B) children inherit 50% of the tendencies toward extraversion or introversion from their mother, and 50% from their father. C) in any given child, half of extraversion is caused by genetic factors and half is caused by the environment. D) in a large group of children, 50% of the variability in extraversion scores would be due to genetic factors.