Many veterans who bravely served in Iraq during Operation Enduring Freedom

| August 30, 2017

Many veterans who bravely served in Iraq during Operation Enduring Freedom or
Operation Iraqi Freedom have developed symptoms of post-traumatic stress
disorder (PTSD) or similar ailments. A large study of returning veterans showed
that 52.7% of the soldiers suffered from a PTSD or similar ailment after serving
in Iraq. A random sample of 200 veterans from Iraq were selected for additional research.
The number suffering from PTSD or a similar condition was recorded.
(Source: Frayne SM, et al. (2010) Medical care needs of returning veterans with
PTSD: their other burden. Journal of General Internal Medicine 26(1).)
a. Explain why this is a binomial experiment.
b. What is the mean of X, the number of people suffering from PTSD in a
sample of 200 veterans?
c. In the sample of 200, the expected number of veterans with PTSD is __________.
d. Compute the standard deviation.
e. Would it be unusual to find 110 individuals suffering from PTSD in a
group of 200 veterans?

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