Question Wording

I agree that we keep "prefer not answer" as an option, although voting behaviour is not that a personal thing. There might be few people who are not willing to tell and incase of the situation that respondents choose an option that they don't really want to choose in fact. That would undermine the truthness of our data.

With regard to the purpose of the research, it is not only to "prove" the colleration between the media and voting turnout, but it would also be interesting to see in what ways are the related.(e.g. what kind of media is most effective in sparking people's interests and participation in politics). This kind of question has practical implication for political compaign.