Variable 1: Caffeine

Variable 2: depression

1. Identify which variable will serve as the independent variable (IV) and the other as the dependent variable (DV). Caffeine will serve as the independent variable. Depression will be my dependent variable.

2. How would you manipulate, or change the value, of your IV to determine if different levels of your IV impact the DV? Provide at least 3 different values/levels ofyour IV.

Independent-Groups or Between-Groups Designs

For your first study, you want to utilize anindependent-groups designto test the impact of your IV on your DV.

3. Would participants experience each IV level (condition) or just one of the IV levels (conditions)?

4. Discuss a specific advantage of using an independent-groups design in measuring your IV's impact on your DV.

5. Discuss a specific disadvantage of using an independent groups design in measuring your specific IV's impact on your DV.

6. What would be a threat to internal validity using this independent-groups design foryour study?

Within-Groups Designs

For your second study, you want to utilize awithin-groups designto test the impact of your IV on your DV.

7. Would participants experience each IV level (condition) or just one of the IV levels (conditions)?

8. Discuss a specific advantage of using a within-groups design in measuring your IV's impact on your DV.

9. Discuss a specific disadvantage of using a within-groups design in measuring your IV's impact on your DV.

10. What would be a threat to internal validity using this within-groups design foryour study?

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