What percentage of Americans believes that parents in an unhappy marriage should stay together for the sake of the children?

When Schaie conducted cross-sectional research comparing the cognitive abilities of adults of different ages, he found

a gradual increase in intellectual ability with age. a gradual decline in intellectual ability with age. a sudden decline in intelligence in middle adulthood. no age-related patterns of intellectual development.

Sandra is watching some of her classmates on the play ground. They have become rowdy and

are hitting each other with the jump ropes. The recess monitor intervenes and the children are placed into time-out as Sandra watches. The next day when the jump ropes are distributed at recess, Sandra is careful to use them to jump. This is an example of a. classical conditioning. b. operant conditioning. c. the ego. d. observational learning.