Does stress affect the recall ability of police eyewitnesses? This issue was studied in an experiment that tested eyewitness memory a week after a nonstressful interrogation of a cooperative suspect and a stressful interrogation of an uncooperative and belligerent suspect. The numbers of details recalled a week after the incident were recorded, and the summary statistics are given below. Use a 0.01 significance level to test the claim in the article that €œstress decreases the amount recalled.€

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Non stress: "-40, x-5 3.3,,.. 11.6 Stress n40, 45.3, s 13.2