13. Construct validity refers to:

16. A control condition is included in an experiment to:

1. Which of the following best defines an experiment in psychology?

11. Validity refers to:

1. Which of the following best defines psychological measurement?

6. A nominal level of measurement is characterized by:

3. An operational definition is:

6. Which of the following best describes a between-subjects design?

19. Which of the following represents a threat to validity?

5. The main purpose of using operational definitions is to: