What percentage of babies did Thomas and Chess find met their definition of "slow-to-warm-up" babies?

You obtain the following scores: 10, 8, 6, 4, 2. The sample variance for this set of five scores is 10.

a. true b. false

In contrast to Freud, Erikson thought that the main issue for the toddler (e.g., approximately age 2) was not toilet training but _____________

a. developing a secure attachment to the parent b. achieving autonomy from the parent c. imprinting on the parent d. ego development