Question

You want to know the brand of jeans worn most often by people 20 to 30 years old. Which of the following surveys is biased?

Answer 1

post the options..

Answer 2

..

Answer 3

surveying people 20 to 30 years old at a store that sells one brand of jeans
surveying people 20 to 30 years old at a store that sells only jeans
surveying everyone at a store that sells only jeans

Answer 4

surveying people 20 to 30 years old at a store that sells one brand of jeans