A surveyor wants to know how many shoppers at a mall like to read books. He surveys 100 people coming out of a bookstore at the mall. Why is the sample biased?
A.
There are not enough people in the sample.
B.
It is unlikely that people who shop in bookstores are interested in surveys.
C.
The surveyor did not sample the entire population at the mall.
D.
People who shop in bookstores are likely to read more books than those who do not.
Well both C and D would both be correct, but D would be "more" correct. He is specifically targeting people who are likely to enjoy books, because people that do not enjoy books are significantly less likely to be inside a book store.
