Psychological Assessment (Mar 1995) published the results of a study of World War II aviators who were captured by German forces after they were shot down. Having located a total of 239 WWII aviator...

Hyphothesis testing.

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Extracted text: Psychological Assessment (Mar 1995) published the results of a study of World War II aviators who were captured by German forces after they were shot down. Having located a total of 239 WWII 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 or (PTSD). [Note: the higher the score, the higher the level of PTSD.] The aviators produced a mean PTSD score of 9.00 and a standard deviation of 9.32. A. Set up the null and alternative hypotheses for determining whether the true mean PTSD score of all WWII aviator PÕWS is less than 16. [Note: the value, 16, represents the mean PTSD score established for Vietnam POWS.] B. Conduct the test, in A, using 10% level of significance. What are the practical implications of the test?