Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. a random sample of 300 students taken from this year's student body showed the following number of students in each class 83 freshmen 68 sophomores juniors 85 seniors 64 we are interested in determining whether there has been a significant change in the distribution of class between the last school year and this school year refer to exhibit 12-2 the hypothesis is to be tested at the 5% level of significance. the critical value from the table equals a. 1.645 b. 1.96 c. 7.815 d. 2.75 in the past, 35% of the students at abc university were in the business college, 35% of the students were in the liberal arts college, and 30% of the students were in the education college. to see whether the proportions have changed, a random sample of 300 students from abc university was selected. ninety of the sample students are in the business college, 120 are in the liberal arts college, and 9o are in the education college. refer to exhibit 12-4. if the proportions are the same as they were in the past, the expected frequency for the business college is b. 35 c. 90 d. 105 in the past, 35% of the students at abc university were in the business college, 35% of the students were in the liberal arts college, and 30% of the students were in the education college. to see whether the proportions have changed, a random sample of 300 students from abc university was selected. ninety of the sample students are in the business college, 120 are in the liberal arts college, and 90 are in the education college. refer to exhibit 12-4. based upon this test, what can be concluded? a. the test is inconclusive. b. there is enough evidence to conclude that the proportions have not changed significantly c. there is enough evidence to conclude that the proportions have changed significantly. d. none of these answers are correct.