Assume that each sample is obtained by randomly selecting values from a population with a normal distribution.
A sample of 35 skulls is obtained for Egyptian males who lived around 1850 BCE. The maximum breadth of each skull is measured with the result that = 134.5 mm and s = 3.5 mm (based on data from Ancient Races of the Thebaid by Thomson and Randall-Maciver). Using these sample results, construct a 95% confidence interval for the population standard deviation s.