Which factor is least likely to affect voter turnout?

The least likely factor to affect voter turnout is height of the voter. Voter turnout is significantly influenced by various socio-economic and psychological factors. Education level is closely correlated with turnout, as individuals with higher education tend to be more informed and engaged in the electoral process. Political efficacy, or the belief that one's vote can make a difference, also plays a crucial role in motivating people to participate in elections. Age is likewise a strong predictor, with older individuals generally exhibiting higher turnout rates compared to younger voters.

In contrast, height is not associated with the factors that drive voter participation. It does not influence an individual’s engagement, awareness, or belief in the voting process. Therefore, it stands out as the factor least likely to affect whether someone votes or not.