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?



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 1

any ideas?

Answer 2

i think its the first one

Answer 3

yeap, because is narrowed down to one brand only, thus is biased towards that brand

Answer 4

k thanks

Answer 5

yw