Preliminary analyses indicate that you can consider the assumptions for using nonpooled t-procedures satisfied. Researchers randomly and independently selected 29 prisoners diagnosed with chronic posttraumatic stress disorder (PTSD) and 21 prisoners that were diagnosed with PTSD but had since recovered (remitted).
Chronic Remitted
x1 = 29.7 x2 = 22.6
s1 = 3 s2 = 9
n1 = 29 n2 = 21

Obtain a 95% confidence interval for the difference, µ1 - µ2, between the mean ages at arrest for prisoners with chronic PTSD and remitted PTSD.