Suppose a survey is conducted five years ago at a university showed that there are 500 students

out of all the 5000 students would like to go graduate school after they obtained the bachelor's

degree. This year a new survey was conducted on a random sample of 500 students from this

university, and it was found that 80 of them would like to go graduate school after they graduate.

Do these data provide convincing evidence to suggest that the percentage of students who would

like to pursue higher degree has changed over the last five years? This university would like to

find whether the change has been significantly increased or not.