Test Yourself

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1. Internal validity is important if you are to determine why people behave as they do
2. Simple experiments, when performed in laboratories under highly controlled conditions, allow researchers to keep all nontreatment variables constant, thereby allowing researchers to isolate the cause of an effect.
3. If you randomly assign participants to treatment or to no treatment , the treatment will be the only difference between your treatment group and your no treatment group.
4. Which of the following is an experimental hypothesis?
5. Which of the following is a null hypothesis?
6. If you reject the null hypothesis in a study about the effects of watching political debates on attitude change, you conclude that
7. If you fail to reject the null hypothesis in a study about the effects of watching political debates on attitude change, you conclude that
8. In the experiment looking at the effects of full-spectrum light on mood, full-spectrum light is the experimental group
9. In the experiment looking at the effects of full-spectrum light on mood, mood is the
10. The control group is the comparison group.
11. The treatment group and control group should be preexisting groups.
12. Because of the value of independence, you may have to test your participants individually.
13. Which of the following can be randomly assigned?
14. The best description of a statistically significant difference is a difference that is
15. A statistically significant difference indicates that the difference was important and in the predicted direction.




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