A researcher wants to see if a new phone app can help to treat anxiety better than in-person therapy or medication. She has participants in her study complete two weeks of treatment with the app, two weeks of treatment with medication, and then two weeks of treatment in-person with a therapist. She compares anxiety scores after each round of treatment.

1. How many levels are there for the independent variable? a) 1 b) 2 c) 3 d) 4

2. What is the confound?

3. How could the confound be fixed?

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