A school counselor wants to test a technique to reduce procr…
A school counselor wants to test a technique to reduce procrastination in students. Students time their procrastination for a week, which is used as a pretest indicator of procrastination. Students then attend a workshop in which they are instructed to use a specific warm-up exercise for studying by focusing on a pleasant activity. For the next week, students again time their procrastination. The counselor then uses the time from this week as the posttest (after) measure. Suppose the counselor found the sum of squared deviations from the mean of the sample to be 135 after testing 10 people. What would be the estimated population variance?