What is the psychiatrist prediction at the 87.2 th percentile? In other words, what is the predicted "administered shock" value that has 87.2% of the distribution equal to or lower than it?
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Prison Isolation Experiment (Adapted from problem 7.31) 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. (The "psychopathic deviant T 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: Treatment 1: Four hours of sensory restriction plus a 15-minute "therapeutic" tape advising that professional help is available. Treatment 2: Four hours of sensory restriction plus a 15-minute "emotionally neutral" tape on training hunting dogs. Treatment 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. Treatment 1 Treatment 2 Treatment 3 Mean 6.21 2.86 -3.21 SD 12.3 7.94 8.57 n 14 14 14 Compute the p-value for the treatment that produced the greatest reduction in subjects' psychopathic deviant T scores.
Shyam P.
To test compliance with authority, a classical experiment in social psychology requires subjects to administer increasingly painful electric shocks to seemingly helpless victims who agonize in an adjacent room.* Each subject earns a score between 0 and $30,$ depending on the point at which the subject refuses to comply with authority-an investigator, dressed in a white lab coat, who orders the administration of increasingly intense shocks. A score of 0 signifies the subject's unwillingness to comply at the very outset, and a score of 30 signifies the subject's willingness to comply completely with the experimenter's orders. Ignore the very real ethical issues raised by this type of experiment, and assume that you want to study the effect of a "committee atmosphere" on compliance with authority. In one condition, shocks are administered only after an affirmative decision by the committee, consisting of one real subject and two associates of the investigator, who act as subjects but, in fact, merely go along with the decision of the real subject. In the other condition, shocks are administered only after an affirmative decision by a solitary real subject. A total of 12 subjects are randomly assigned, in equal numbers, to the committee condition $\left(X_{1}\right)$ and to the solitary condition $\left(X_{2}\right)$. A compliance score is obtained for each subject. Use $t$ to test the null hypothesis at the .05 level of significance.
14.11 To test compliance with authority, a classical experiment in social psychology requires subjects to administer increasingly painful electric shocks to seemingly helpless victims who agonize in an adjacent room. Each subject earns a score between 0 and 30, depending on the point at which the subject refuses to comply with authority—an investigator, dressed in a white lab coat, who orders the administration of increasingly intense shocks. A score of 0 signifies the subject's unwillingness to comply at the very outset, and a score of 30 signifies the subject's willingness to comply completely with the experimenter's orders. Ignore the very real ethical issues raised by this type of experiment and assume that you want to study the effect of a "committee atmosphere" on compliance with authority. In one condition, shocks are administered only after an affirmative decision by the committee, consisting of one real subject and two associates of the investigator, who act as subjects but, in fact, merely go along with the decision of the real subject. In the other condition, shocks are administered only after an affirmative decision by a solitary real subject. A total of 12 subjects are randomly assigned, in equal numbers, to the committee condition (X1) and to the solitary condition (X2). A compliance score is obtained for each subject. Use t to test the null hypothesis at the .05 level of significance. Compliance Scores Committee 2 5 20 15 4 10 Solitary 3 8 7 10 14 0
David N.
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