Question: Call the shots An advertisement for an upcoming TV show asked: "Should handgun control be tougher? You call the shots in a special call-in poll tonight. If yes, call 1-900-720-6181. If no, call 1-900-720-6182. Charge is 50 cents for the first minute." Over 90% of people who called in said "Yes." Explain why this opinion poll is almost certainly biased.