Post-traumatic stress of POWs. Psychological Assessment (March 1995) published the results of a study of World War II aviators captured by German forces after having been shot down. Having located a total of 239 World War II aviator POW survivors, the researchers asked each veteran to participate in the study; 33 responded to the letter of invitation. Each of the 33 POW survivors was administered the Minnesota Multiphasic Personality Inventory, one component of which measures level of post-traumatic stress disorder (PTSD). [ Note: The higher the score, the higher is the level of PTSD.] The aviators produced a mean PTSD score of and a standard deviation of s = 9.32. Conduct a test to determine if the true mean PTSD score for all World war II aviator POWS is less than 16. [Note: The value 16 represents the mean PTSD score established for Vietnam POWS.] Use α =.10.
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