I surveyed 40 people from a poor area of town and 60 people from an affluent area of town about their feelings towards minorities. I counted the number of negative comments made. I was interested in comparing their attitudes. The average number of negative comments in the poor area was 16 and in the affluent area was11. The standard deviations were 6 and 3 respectively. Let's determine a 95% confidence interval for the difference in mean negative comments.