Many large cities use taxes on entertainment tickets to pay for improvements to public facilities, like stadiums, arenas, and concert venues. A city council proposal would increase the current ticket tax in order to raise funds for a new
public concert hall. Council representatives plan to conduct a survey outside of a large concert in the summer and ask
selected adults if they would support an increase in the ticket tax to pay for the new concert hall. Which type of bias will
most likely affect the survey results?