Faculty at a community college decide to survey a sample of students to determine if they feel they have been properly advised into their current math courses. They do this by obtaining a list of all math classes currently being offered at the college and assigning a number to each section. They then use a random number generator to select 8 sections. All students in each of the 8 sections were contacted to complete a survey on the first day of class. A psychology instructor with a large number of students attempts to reduce time spent grading by only grading a portion of assigned homework problems. He randomly selects one of the first five problems in the assignment to grade and 1. systematic sample 2. stratified sample 3. random sample 4. convenience sample 5. cluster sample 13 > >