Selma wants to know if seventh grade students prefer to do their math homework in silence or with background music. She polled
the 30 students in her music class. Ten students preferred to do their math homework in silence, and twenty students preferred to do
their math homework with background music.
Is there a sampling bias in the situation above?
A.
Yes. Students in the music class will probably enjoy listening to music more than other students.
B.
There is not enough information.
C. Yes. Selma is only curious about 7th grade students, but 6th grade students may prefer background music too.
D. No. Selma picked a completely random sample for her study.