An experiment was conducted to investigate the effect of stress on the recall ability of police eyewitnesses. The experiment involved a non stressful interrogation cooperative suspect and a stressful interrogation of an uncooperative and belligerent suspect. The numbers of details recalled a week after the incident are summarized in the margin (based on data from "Eyewitness Memory of Police Trainees for Realistic Role Plays," by Yuille et al., Journal of Applied Psychology, Vol. 79, No. 6). Use a 0.10 level of significance to test the claim that the samples come from populations with different standard deviations.