A social worker is interested in estimating the average length of time spent outside of prison for first offenders who later commit a second crime and are sent to prison again. A random sample of n = 150 prison records in the county courthouse indicates that the average length of prison-free life between first and second offenses is 3.2 years, with a standard deviation of 1.1 years. Use they sample information to estimate m, the mean prison-free life between first and second offenses for all prisoners on record in the county courthouse. Construct a 95% confidence interval form. Assume that s can be replaced by s.