Mrs. Liang, the librarian, wants to compare the numbers of patrons who prefer e-books to paperback books. She decides to take a poll of every third adult with a child who arrives at the library for one of the four reading groups: toddlers, preschoolers, primary grades, and upper elementary. Which statement is true about her method of data collection?
Answer
A
It is balanced because she is polling four different reading groups, which include all types of people.
B
It is balanced because she is including parents with children of all ages so she will get a greater age range.
C
It is not balanced because she only surveyed the adults and not the young children.
D
It is not balanced because it is less likely to include teens, young adults, and senior citizens in the patron population.
Explanation
The poll only includes adults who arrive with a child for one of the four reading groups. That leaves out many library patrons, including teens, young adults without children, and senior citizens, whose book preferences may differ. So the sample is not balanced for representing all patrons; choice D is correct.
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