10. In a study to investigate whether lack of sleep hurts short-term memory, 10 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 results are given in the table on the right. Does the lack of sleep decrease short term memory ? (Use a= 0.05). with sleep without sleep 23 18 29 20 14 10 21 25 24 22 29 27 28 17 21 20 30 25 26 21 (A) Yes (B) No

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