Identify which of the following studies should be tested using two-way ANOVA, bivariate correlation, and multiple regression. 1. A study comparing number of symptoms of PTSD in combat and non-combat veterans that have just returned home, home for one year, and home for five years. 2. A study examining how well age and income predict likelihood to retire. 3. A study trying to determine the nature of the relationship between studying and test performance. 4. A study looking for differences in relationship satisfaction based on gender and marital status.

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