I want to conduct a CBC and I am not sure if the main effects or the interaction effects (or both) is important for me.
The study is about wine and I have the following attributes: price with 7 levels, quality (in points) with 5 levels, and grape with 5 levels.
I want to use the CBC to calculate the participants' willingness to pay for different wines. But I am not sure whether the main effects are important here or if I need to look at the interaction effects because price and quality could interact.
And am I right by using the balanced overlap design here?
Thank you for your help,