Now that you have completed Chapter 6, you should be able to:

1. Explain the difference between validity and reliability.
2. Describe the impact that random error and systematic error have on one's measurements.
3. Discuss how test-retest reliability and alternate-forms reliability are used to assess the stability of an instrument.
4. Explain what is meant by internal-consistency reliability.
5. Describe how the Spearman-Brown formula can be used to assess internal-consistency reliability.
6. Explain how one might conclude whether or not a replication attempt has been successful.
7. Define content validity.
8. Explain what is meant by criterion validity and how it can be assessed.
9. Discuss the importance of construct validity in test development and how it can be established.
10. Differentiate among the four types of validity that play a role in making causal inferences.