It is known that on a particular high school campus, 62 percent of all students are juniors, 23 percent are seniors, and 15 percent are freshmen and sophomores. A sample of 80 students attending a concert was taken. Of these sample members, 74 percent were juniors, 17 percent were seniors, and 9 percent were freshmen and sophomores. Test the null hypothesis that the distribution of students attending the concert was the same as the distribution of students on campus.