You decide to survey students about the dining options on campus . Match each description below to the sampling method it describes . Obtain a list of every student at your school from the Registrar's office and randomly select 200 student IDs . Randomly choose three letters and include everyone whose last name begins with one of those letters . Group students by number of credits completed and randomly select 5 % of the students from each group . Obtain a list of every student at your school from the Registrar's office and select every 10th student from the list . Stand outside the dining hall on three different days and interview everyone : that walks past you