In a study to investigate whether lack of sleep hurts short-term memory, 100 adults were each tested twice. Both times they studied a list of 30 words for two minutes, and were then asked to recall as many as possible, with a different but comparable list used each time. For one of the two tests they had been without sleep for 24 hours, while for the other they had a normal amount of sleep. The order was randomly assigned. The difference in number of words recalled (with sleep - without sleep) was recorded for each person. The average difference was 1.5 words, with a standard deviation of 6.1 words. Carry out the five steps of the hypothesis test for this situation. Use a = 0.05. P W e