With reference to Exercise 11.30, construct a 95% confidence interval for the true variance of the skull length of the given species of bird.
In exercise
The length of the skulls of 10 fossil skeletons of an extinct species of bird has a mean of 5.68 cm and a standard deviation of 0.29 cm. Assuming that such measurements are normally distributed, find a 95% confidence interval for the mean length of the skulls of this species of bird.