Match the vocabulary terms with their definitions. 1. population sum of all numbers divided by the total number of scores; the average 2. qualitative something that is likely to change 3. variable rules of conduct; moral principles 4. mean research that explores the "why" and "how" of situations 5. median the number that occurs most often in a given set of numbers 6. mode revealing and explaining all aspects of an experiment to a participant 7. debrief the middle number in a set of ordered numbers 8. ethics a whole group