What kind of variable in the response? List the population of interest as well? 1. Voters : A February 2007, Gallup Poll questions asked, as politics today, do you consider yourself a Republican, a Democrat, Independent? Possible answers are "Republican", "Democrats", "Independent", and "No Response". 2 Mood; A January 2007, Gallup Poll questions asked, in general, do you think things have gotten better or gotten worse in this country (USA) in the last five years? Possible answers are "Better", "Worse", "No Change", "Don't know", and "No Response". 3. Medicine. A pharmaceutical company conducts an experiment in which a subject takes 100mg of a substance orally. The researcher measure how many minutes it takes for half of the substance to exit the bloodstream. What kind of variable the company studying? 4. Stress. A medical researcher measures the increase in heart rate of patients under a stress test. What kind of variable in the researcher studying