A research wants to compare the effects of a new anxiety medicine. She randomly places 120 subjects into one of three groups: those who receive the medication, those who receive a placebo, and those who receive no medication.

Questions:

1. What is her null hypothesis?

2. What would be one alternative hypothesis?

3. Is her Independent Variable categorical or continuous?

4. What type of statistical test (i.e., the specific type of t-test or ANOVA) would she use to compare the classes?

5. Is this an experiment or observational study?