Question

You want to know the type of music listened to by 15- to 20-year-olds.

Which of the following surveys is biased?
surveying people 15 to 20 years old leaving a concert
surveying people 15 to 20 years old on the street
surveying everyone at the local music store

Answer 1

Answer: leaving a concert

Explanation:

most of the people leaving the concert probably really like that kind of music so it would be biased to survey them

Answer 2

Surveying people coming out of a concert because it will be all people who like the concert they were just attending.