According to a study of political prisoners, the mean duration of imprisonment for 32 prisoners with...
According to a study of political prisoners, the mean duration of imprisonment for 32 prisoners with chronic post-traumatic stress disorder (PTSD) was 31.8 months. Assuming that sigmaequals38 months, determine a 95% confidence interval for the mean duration of imprisonment, mu, of all political prisoners with chronic PTSD. Interpret your answer in words.
A 95% confidence interval for the population mean is from ____months to____months.
Homework Answers
Since the population sd is known, we can z-distribution to calculate the confidence interval.
Now, from the z-table, z score for 95% confidence level is 1.96.
Hence,
CI= 
= 31.8 
= 31.8 
13.166
=[18.634, 44.966]
So,
A 95% confidence interval for the population mean is from 18.634 months to 44.966 months.
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