Scenario C. An ad for a new vitamin supplement claims to reduce the appearance of aging (specifically, fine lines and wrinkles) when taken with a full glass of water first thing in the morning. The company decides to test this claim so that they can strengthen their advertisements. The company recruits a sample of participants from their stores and randomly assigns them to either receive a 30 day supply of the vitimin or to receive nothing. After 30 days, she follows up with the participants and asks them to report on the improvement in their appearance.

1. What is the independent variable for Scenario C?

2. How many levels are there for the independent variable in Scenario C?

3. Whattypeof independent variable is the IV in scenario C? Explain why you think the IV is that type of IV.

4. What is the dependent variable for Scenario C?

5. Provide an operational definition for the dependent variable in this study. Some important information that needs to be included in your operational definition includes:

• "what is the dv (how do you define it)?"
• "how will you measure the dv?

6. What is the confound for Scenario C

7. How could the confound be fixed in Scenario C?