Which type of reinforcer is most likely to promote transfer and generalization?

Dr. Halk is studying the influence of getting older on intelligence. He tests a group of first graders, a group of third graders, and a group of sixth graders. They are all tested in one day. This is an example of _______ research

a. cross-sectional b. longitudinal c. mixed design d. fixed effects

The first intelligence test was:

a. Created by Alfred Binet b. Designed to match high school students to career paths c. Used as part of a screening device for immigrants to the United States during the 1920's d. Designed to identify gifted grammar school students