Vacation Days During a recent year, working Americans took on average 19 vacation days. This survey was based on a random sample of 20 workers. The standard deviation of the sample was 2.3 days. Find the 95% confidence interval for the mean number of vacation days workers took per year, Assume the population is normally distributed. Use @ The t Distribution Table. Round intermediate answers to at least three decimal places. Round your final answers to the nearest whole number. < H X