A Counseling Psychologist Developing a Technique to Reduce Procrastination Has

Multiple Choice

A counseling psychologist developing a technique to reduce procrastination has students time their procrastination for a week and uses this as a pretest measure of procrastination. Students then attend a workshop in which they are instructed to do a specific warm-up exercise for studying by focusing on a pleasant activity. Students again time their procrastination for a week, and the time from this second week is the posttest measure.
-If the psychologist wants to see if there is a change (increase or decrease) in procrastination by students who attended his workshop,the appropriate description of "Population 2" (the comparison population) would be people whose

A) posttest scores will be lower than their pretest scores.
B) difference scores will be 0 or greater than 0.
C) difference scores will be 0.
D) difference scores will be smaller than their pretest scores.