in a 2014 article, Evan McCuish, Raymond Corrado. Patrick Lussier, and Stephen D. Hart Investigated the role of pschopathic traits in determining patterns of offending from adolescence into adulthood. They found those with psychopathic traits were far more likely to have more serious offending trajectories. Let's say you have a sample of 20 young males who have been in juvenile institutions at least twice. The mean psychopathic trait score for these 20 males was 18 with a standard deviation of 4. Build a 99% confidence interval around this point estimate.