Problem 3






  1. present a contingency table


  2. state the appropriate null and the alternative hypothesis


  3. for each test


    1. determine a critical value using


    2. present a test statistic


    3. present a p-value


    4. interpret  the p-value


    5. state your decision


    6. state your conclusion




In a study of 112 patients with acute brief episodes of psychoses, researchers classified subjects into four personality types: obsessiod, asthenic/low self-confident, asthenic/high self-confident, and nervous/tense. The table below crosses-classifies these personality types with three groups of subjects: those with acute and transient psychotic disorders (ATPD), those with “positive”schizophrenia (PS), and those with bipolar schizo-affective disorder (BSAD). Perform an appropriate test to determine if personality types and disorder groups are related.





Personality Type



Obsessoid (O)


 Self-confident (A)

Asthenic/high Self-confident (S)

Nervous/tense (N)

















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