The main campus of a university in Pennsylvania has a population of about 42 , 000 students. A survey was administered to a sample of 2 , 000 students about whether or not they smoke. Part A: What is the population of interest? 42 , 000 students from the main campus of the university All students in college 2 , 000 students from the main campus of the university Students from the main campus of the university who smoke Part B: What is the sample? 42 , 000 students from the main campus of the university All students in college Students from the main campus of the university who smoke 2 , 000 students from the main campus of the university