Let X be a random variable following a normal distribution.

A sample is taken from a population.

If n= 8

sample mean = 7.2

(i=1) E (n=8) [x(i) - x-bar ]^2 = 3.44

Calculate a 99% confidence interval for the population standard deviation?

Do you do this by first solving for the population variance confidence interval and then taking the square root of the upper and lower limits?