Mr. Connelly, the school teacher-librarian, wants to purchase new books for the school
library. He has the following ideas for
collecting data:
A. Observe which books are most
commonly taken out, and buy more
books by the same authors.
B. Ask all the students who come into the
library what new books they would like
to have in the library.

C. Visit a Web site that lists the award-
winning books for the past three years.

D. Create a questionnaire to give to all the
students in the school, asking about
their favourite kinds of books.
a) Which ideas involve collecting primary
data?
b) Which ideas include a bias in favour
of students’ opinions?
c) Which idea includes a bias against
students’ opinions?