Babies: According to a recent report, a sample of 360 one-year-old baby boys in the United States had a mean weight of 25.5 pounds. Assume the population standard deviation is 0 : 5.3 pounds. (a) Construct a 95% confidence interval for the mean weight of all oneyearold baby boys in the United States. Round the answer to at least one decimal place. A 95% condence interval for the mean weight in pounds of all one-yearold baby boys in the United States is