For your project, you should have chosen a design that simply investigates the association between two variables (e.g., gender and salary). For this assignment, I want you to consider how you might include an additional variable. This additional variable could be a numeric variable or a categorical variable. Here are some examples to help spur your creativity:

• if you're already studying the relationship between stress and sleep, you could add the variable work hours
• if you're already studying the relationship between social media usage and depression, you could add the categorical variable platform (e.g,. Facebook, TikTok, Twitter).

General Topic:Impact of Childhood Trauma on Adult Mental Health

Independent Variable: Childhood Trauma

Dependent Variable: Adult Mental Health

Once you've selected your new variable, answer the following in the discussion question:

1. What is your hypothesis about the main effect of the new variable
2. What is your hypothesis about the interaction effect of the new variable
3. (Bonus) Draw a figure and upload it to the discussion board that shows how you think the interaction might look