IS THERE A SIGNIFICANT DIFFERENCE AT THE 5% LEVEL BETWEEN THE STAYING AWAKE TIMES OF THESE TWO GROUPS OF STUDENTS IN A LECTURE HALL? WORK BY HAND AND SHOW THE RESULTS OF EACH STEP.

CAFFEINE	NO CAFFEINE
30 60 45 80 -5 (FELL ASLEEP BEFORE CLASS STARTED) 90 100 90 115 120 110 85 120 120 50	90 80 90 100 110 120 15 90 110 30 110 60 60 90 120