Practice Exercises

1. Arrange with an instructor in a large class to conduct a multiple pretest–posttest study of the impact of watching a regularly scheduled class movie. Design a 10-question questionnaire to measure knowledge about the topics in the film. Administer this questionnaire shortly before and shortly after the film is shown and then again 1 week afterward. After scoring the knowledge tests, describe the immediate and long-term impact of the movie.

2. Volunteer for an experiment! Contact the psychology department, and ask about opportunities for participating in laboratory experiments. Discuss the experience with your classmates.

3. Complete the Interactive Exercise for Chapter 7.

4. Select an article that used an experimental design from this site. Diagram the design and identify sources of internal and external invalidity that are not controlled by the experimental design.