In multiple bounded discrete choice (MBDC) format, for each price, the respondent indicates how certain she would be to vote in favor of a policy by choosing, for example, among “definitely yes”, “probably yes”, “not sure”, “probably no”, and “definitely no” response options.
I want to assess the normality of all my variables, including the WTP, and conduct a t-test to compare differences among variables from two different surveys (online vs face to face). But right now, I'm stuck because I don't know how to deal with the WTP format.