A recent student project asked students at Cal Poly (where one of the authors teaches) whether they have ever been arrested on alcohol- or drug-related charges, including drunk driving. Out of 57 students surveyed in the College of Business, only four reported they had been arrested (the surveys were made anonymous to encourage truthful responses). Assuming these 57 students comprise a random sample of all business students at the school, and assuming students answered truthfully, estimate with 95% confidence the proportion of all business students who have been arrested on such charges.