Post-traumatic stress of POWs. Refer to the Psychological Assessment study of World War II...

Post-traumatic stress of POWs. Refer to the Psychological Assessment study of World War II aviator POWs, presented in Exercise 6.29 (p. 314). You tested whether the true mean post-traumatic stress disorder score of World War II aviator POWs is less than 16. Recall that and s = 9.32 for a sample of n = 33 POWs.

a. Compute the p-value of the test.

---

b. Refer to part a. Would the p-value have been larger or smaller if  had been larger?

Exercise 6.29

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.

a. Set up the null and alternative hypotheses for determining whether the true mean PTSD score of all World War II ? aviator POWs is less than 16. [Note: The value 16 represent the mean PTSD score established for Vietnam POWs. ]

---

b. Conduct the test from part a, using α = .10.What arethe practical implications of the test?

---

c. Discuss the representativeness of the sample used in ulc study and its ramifications.