16. A sample of 66 obese adults was put on a lowcarbohydrate diet for a year. The average weight loss was 11 pounds and the standard deviation was x  .67s/1n x  2.05s/1n x  .84s/1n x  89.10 19 pounds. Calculate a 99% lower con dence bound for the true average weight loss. What does the bound say about con dence that the mean weight loss is positive?