To test the hypothesis in exercise 8, the admissions counselors select a random sample of freshmen and compare their scores on the SAT with those of the population of upperclassmen. They find that the freshmen do in fact have a higher mean SAT score. However, they are unaware that the sample of freshmen was not representative of all freshmen at Brainy University. In fact, the sample overrepresented those with high scores and underrepresented those with low scores. What type of error (Type I or Type II) did the counselors make?