Question

Sherry is doing a class project and wants to see whether people in her community are more likely to consider themselves 'introverts' or 'extroverts'. She gets a few friends together with clipboard surveys and they go to a mall entrance where they ask people to participate in a brief survey. They find that 86% of the respondents consider themselves extroverts. This result is

Answer 1

Perhaps biases, ads the introverts might not even respond to the questions or be too embarrassed to admit what they are.