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According to a study of political​ prisoners, the mean duration
of imprisonment for 33 prisoners with chronic​ post-traumatic
stress disorder​ (PTSD) was 33.6 months. Assuming that sigma
equals44 ​months, determine a 90 ​% confidence interval for the
mean duration of​ imprisonment, mu ​, of all political prisoners
with chronic PTSD. Interpret your answer in words.
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