In an effort to estimate the percentage of Eagle Rock students who prefer Hip Hop / Rap music over rock or other pop music, we surveyed a random sample of 20 students from each grade, that is, a total of 120 students. They were asked to answer yes or no to the question: "Do you prefer hip hop / rap over all other forms of popular music?" 33 students answered yes. 1) What assumptions and conditions should we consider before calculating an inference about the ratio of the entire dence interval to make the school prefer hip hop / rap over other pop music?