← Internal Validity Test
3 Written Questions
3 Multiple Choice Questions
- The impact of a threat can be added to that of another threat or may depend on the level of another threat.
- Lack of Clarity about which variable occurred first may yield confusion about which variable is the cause and which is the effect.
- When units are selected for their extreme scores, they will often have less extreme scores on other variables, an occurrence that can be confused with a treatment effect.
3 True/False Questions
Attrition → Naturally occuring changes over time could be confused with a treatment effect.
History → Exposure to a test can affect scores on subsequent exposures to that test, an occurrence that can be confused with a treatment effect.
Testing → Events occurring concurrently with treatment could cause the observed effect.