In a random sample of 24 adult men from Centerville, the mean weight was 198 pounds, with a sample standard deviation of 13 pounds. In a random sample of 13 adult men from Statsburgh, the mean weight was 174 pounds, with a sample standard deviation of 9 pounds. Both samples appeared to be normally distributed. Construct a 99% confidence interval for the difference between 1, the mean weight of all adult men from Centerville, and 2, the mean weight of all adult men from Statsburgh.