Exercise 9. (Page 6H 1.13} Housing proposal across dorms. On a large college campus rstyear students and sophomores live in dorms located on the eastern part of the campus and juniors and seniors live in dorms located on the western part of the campus. Suppose you want to collect student opinions on a new housing structure the college administration is proposing and you vvant to make sure your survey equally represents opinions from students from all years. {a} What type of study is u's? (b) Suggest a sampling strategy for carrying out this study