Prison isolation experiment, Part I. Subjects from Central Prison in Raleigh, NC, volunteered for an experiment involving an “isolation” experience. The goal of the experiment was to find a treatment that reduces subjects’ psychopathic deviant T scores. This score measures a person’s need for control or their rebellion against control, and it is part of a commonly used mental health test called the Minnesota Multiphasic Personality Inventory (MMPI) test. The experiment had three treatment groups:
(1) Four hours of sensory restriction plus a 15 minute “therapeutic” tape advising that professional help is available.
(2) Four hours of sensory restriction plus a 15 minute “emotionally neutral” tape on training hunting dogs.
(3) Four hours of sensory restriction but no taped message.
Forty-two subjects were randomly assigned to these treatment groups, and an MMPI test was administered before and after the treatment. Distributions of the differences between pre and post treatment scores (pre – post) are shown below, along with some sample statistics. Use this information to independently test the effectiveness of each treatment. Make sure to clearly state your hypotheses, check conditions, and interpret results in the context of the data.24
0 20 40
−20 −10 0 10 20
−20 −10 0
Tr 1 Tr 2 Tr 3
Mean 6.21 2.86 -3.21 SD 12.3 7.94 8.57 n 14 14 14
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