You want to know the average height of the students at your school. Which of the

following methods should you NOT use since it will most likely give you biased results and
therefore won't be generalizable to the entire school population?

a. Measure the height of a large number of students who have been randomly selected from
introductory psychology classes at your school.
b. Measure the height of the men's basketball team at your school.
c. Measure the height of a large number of students whose names have been randomly
selected from the school's student directory.
d. Measure the height of a large number of students randomly selected from a larger group
whose college grade point average is 2.0 or above.
e. Measure the height of participants who sign up to participate in the study in return for
money.

b. Measure the height of the men's basketball team at your school.