In 2019, the student body at a specific university in the USA consisted of 30% freshman, 25% sophomores, 27% juniors and 18% seniors. A sample of 400 students taken from the 2020 student body showed that there are 138 freshman, 88 sophomores, 94 juniors, and 80 seniors. Test with a 5% significance level to determine whether the student body proportions have changed.