According to a study of political prisoners, the mean duration of imprisonment for 33 prisoners with chronic post-traumatic stress disorder (PTSD) was 31.2 months. Assuming that o = 35 months, V determine a 90% confidence interval for the mean duration of imprisonment, , of all political prisoners with chronic PTSD. Interpret your answer in words. Click here to view Page 1 of the table of areas under the standard normal curve. Click here to view Page 2 of the table of areas under the standard normal curve. A 90% confidence interval for the population mean is from months to months. (Round to one decimal place as needed.)