# 4 thanks

4. Suppose the number of incoming freshmen is always made up of at least 6000 students. Suppose in 2015, of a SRS of 100 incoming freshmen, 20 finished in the bottom third of their high school class. Admission standards at the university were revised in 2017. In 2019, of a SRS of 100 incoming freshmen, 10 finished in the bottom third of their high school class. Let p1 and p2 be the proportion of all entering freshmen in 2015 and 2019, respectively, who graduated in the bottom third of their high school class. Using the Wilson (plus 4) estimation, a 90% confidence interval for p1 - p2 is