The data to the right represents the number of days of the growing season over the last 10 years in a certain area It is known that the data are normally distributed and s=23.89 days. Using these values as a simple random sample, construct an 80% confidence interval for the population standard deviation of the number of days in the growing season. 164, 188,206, 212, 168, 145, 208, 192, 212,210