Scenаriо 2: A reseаrcher is investigаting the influence оf caffeine cоnsumption from coffee on college students’ sleep duration. Researchers place flyers around campus to recruit regular coffee drinkers at Penn State University. Regular coffee drinkers are then randomly assigned to 1 of the following caffeine consumption conditions: consuming 1-2 cups coffee/day, consuming 3-4 cups coffee/day, or consuming more than 4 cups coffee/day. All participants must consume the prescribed amount of coffee daily for one month. At the end of the study, participants receive an Actigraph accelerometer to wear on their wrist to track their sleep for a week. Researchers plan to examine differences in sleep duration across the caffeine consumption groups. Please identify each of the following: