Seymour appears unhappy or ill because he often looks sullen and withdrawn; when his boss asked him about this, he indicated that he actually feels fine. This is an example of

Jacob tried to open all the doors in the house by jiggling the handle. He is using the schema of:

a. assimilation b. accommodation c. mental structure d. constructivism

A cohort difference is more likely to be present in a __________ design

A) cross-sectional B) longitudinal C) randomized experimental D) time-lag