50 students were polled and asked their age. The sample mean was 23.4 years and the sample standard deviation was 7.2 years. Assume student ages are approximately normally distributed. Find a 90% confidence interval estimate for the population standard deviation . Since the mean and standard deviation are given to tenths place, so should the limits of your interval. __________ < < ___________

Find a 90% confidence interval estimate for the population standard deviation . Round to the nearest tenths place. Note: Since your table does not show 49 degrees of freedom, use the tables values for 50 degrees of freedom.

My answer was 6,2 and 8.7 I showed that isn't correct