A researcher at UNC Charlotte wants to examine how colleges differ in their student success rate. They want to see if student success rates differ across different types of colleges. To evaluate this idea, a team of researchers decides to select a random sample of 300 different 4-year colleges across the U.S. and send a survey that gathers information about their student body and graduation rates. They plan to classify college type into 3 categories: public, private, and for-profit. They also plan to measure graduation rates by calculating the percent of students who graduate within 5-years.